Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

born yesterday

Extremely naïve, gullible, or unintelligent, like a newborn baby. Almost always used in the negative or as a rhetorical question. Don't think you can fool me with that old ruse, I wasn't born yesterday, you know. Of course I know that major political issues can't be fixed overnight. Do you think I was born yesterday?
See also: born, yesterday

yesterday's man/woman

Someone who has passed the pinnacle of their career. Bob is never going to give up his cushy job—he's yesterday's man, and his next career move is retirement!
See also: man, woman

be born yesterday

To be naïve or easily deceived. Often used in the phrase "I wasn't born yesterday." Oh, you expect me to believe that you've been in your room all night and didn't just sneak in the house a few minutes ago? Well, I wasn't born yesterday—and I heard the door open! Do you think I was born yesterday? There's no way that email isn't a scam!
See also: born, yesterday

I wasn't born yesterday

I am not extremely naïve, gullible, or unintelligent. When one is referred to as "born yesterday," they are being likened to a newborn baby, who has no experience with the world. Don't think you can fool me with that old ruse. I wasn't born yesterday, you know. Of course I know that major political issues can't be fixed overnight. I wasn't born yesterday.
See also: born, yesterday

yesterday's news

Someone or something that is no longer receiving or worthy of public interest, importance, or influence. I don't know why you're still campaigning for that hack—he's yesterday's news. The once-prominent social media platform is now yesterday's news among a new generation of smartphone users.
See also: news

a week tomorrow/on (some day)/etc.

One week from the day specified. Primarily heard in UK. I'm flying to Ireland a week on Saturday for my brother's wedding. We need that report finished a week tomorrow.
See also: on, tomorrow, week

a week yesterday/last (some day)/etc.

One week before the day specified. They only gave me the assignment a week yesterday, so I'm really stressed out about getting it finished by tomorrow. Chris left on his work trip a week last Tuesday.
See also: last, week, yesterday

not born yesterday

Not naïve or inexperienced; knowledgeable, intelligent, or shrewd. Don't think you can fool me with that old ruse—I wasn't born yesterday, you know. I know you think Mom is clueless about these things, but she wasn't born yesterday.
See also: born, not, yesterday

a week yesterday

A week and a day before today. I last saw Stu a week yesterday, before he left on vacation.
See also: week, yesterday

need (something) yesterday

To need, require, or desire something very urgently or as soon as possible. James, I need those expense reports yesterday! We can't start the meeting without them! I had a look at your car. Its engine needs a total overhaul, like, yesterday.
See also: need, yesterday

I need it yesterday.

Inf. an answer to the question "When do you need this?" (Indicates that the need is urgent.) Bob: When do you need that urgent survey? Bill: I need it yesterday. Mary: Where's the Wilson contract? Sue: Do you need it now? Mary: I need it yesterday! Where is it?
See also: need, yesterday

need something yesterday

Inf. to require something in a very big hurry. Yes, I'm in a hurry! I need it yesterday! When do I need it? Now! Now! No, I need it yesterday!
See also: need, yesterday

not born yesterday

Fig. experienced; knowledgeable in the ways of the world. I know what's going on. I wasn't born yesterday. Sally knows the score. She wasn't born yesterday.
See also: born, not, yesterday

Yesterday wouldn't be too soon.

Immediately.; Right away. (An answer to the question "When do you want this?") Mary: Mr. Franklin, when do you want this? Fred: Well, yesterday wouldn't be too soon. Alice: When am I supposed to have this finished? Sue: Yesterday wouldn't be too soon.
See also: soon, yesterday

not born yesterday

More experienced and less naive than one appears to be, as in Don't think you can fool me; I wasn't born yesterday. This term gained currency from the title of Garson Kanin's popular Broadway play, Born Yesterday, which was made into an even more popular film. In both, Judy Holliday played a stereotypical dumb blonde who shows more common sense than her sophisticated acquaintances. [Early 1800s]
See also: born, not, yesterday

not born yesterday

If you say that someone wasn't born yesterday you mean that they have enough experience to not be easily tricked. Listen, I wasn't born yesterday. This looks like a work of fiction to me. Note: This expression is often varied. For instance, you can say that someone must think you were born yesterday if they treat you as if you are stupid. They must think I was born yesterday if they think I'd fall for a trick like that.
See also: born, not, yesterday

I wasn't born yesterday

used to indicate that you are not foolish or gullible.
See also: born, yesterday

yesterday's man

a man, especially a politician, whose career is finished or past its peak.
See also: man

yesterday's news

a person or thing that is no longer of interest.
See also: news

I wasn’t born ˈyesterday

(spoken) used to say that you are not stupid enough to believe what somebody is telling you: You don’t expect me to believe that, do you? I wasn’t born yesterday, you know.
See also: born, yesterday

a ˌweek ˈyesterday, last ˈMonday, etc.

(especially British English) seven days before the day that you mention: It was a week yesterday that we heard the news.
See also: last, week

born yesterday

Naive or ignorant. Used in negative constructions: Of course I can use a computer; I wasn't born yesterday.
See also: born, yesterday

born yesterday, not (I wasn't)

Not naive; more experienced than one might think. Already a popular saying by the early nineteenth century, it appeared on both sides of the Atlanti “I warn’t born yesterday,” said Thomas Haliburton’s Sam Slick in one of his Wise Saws (1843). Approximately a century later Garson Kanin used the phrase for the title of a Broadway play that became extremely popular, as did the later (1950) film version. In both, actress Judy Holliday played the quintessential dumb blonde who, despite seeming unsophistication, is graced with enormous good sense.
See also: born, not

so yesterday

Extremely old-fashioned. The “so” in this phrase, which dates from the late 1900s, means “extremely” or “completely.” An article about extending human life indefinitely was headlined “Merely Human? That’s So Yesterday” (New York Times, Ashlee Vance, June 13, 2010). And another, from the Globe and Mail (Montreal), had “The Traditional Job Interview: That’s So Yesterday” (Craig Silverman, April 7, 2008). For an older synonym, see old hat.
See also: yesterday
References in classic literature ?
"And now I think he hates me because-- because you mistook him yesterday. He says it is through me that you will think ill of him--think that he is a false person.
"The day before yesterday," said Dorothea, "when I had asked him to come to Lowick to give me his opinion on the affairs of the Hospital, he told me everything about his conduct and feelings in this sad event which has made ignorant people cast suspicions on him.
"I had an errand yesterday which I did not finish; that is why I am here again so soon.
"Maggie," he said at last, pausing before her, and speaking in a tone of imploring wretchedness, "have some pity--hear me--forgive me for what I did yesterday. I will obey you now; I will do nothing without your full consent.
The yesterday, which could never be revoked,--if she could have changed it now for any length of inward silent endurance, she would have bowed beneath that cross with a sense of rest.
By the way, mamma, I did an unpardonable thing yesterday. I was literally out of my mind.
"Thank God; I was afraid the same thing as yesterday was beginning again," said Pulcheria Alexandrovna, crossing herself.
"Listen, Dounia," he began, gravely and drily, "of course I beg your pardon for yesterday, but I consider it my duty to tell you again that I do not withdraw from my chief point.
As it was done yesterday the strong probability was that we should find the words in yesterday's issue."
The cleverest detective in England spent yesterday under your nose at St.
"Day before yesterday," she repeated, breaking off a spray of Mademoiselle's geranium; "then if you had not met me here to-day you wouldn't--when--that is, didn't you mean to come and see me?"
Pontellier's absence; it's a wonder Mademoiselle Reisz did not tell me; and your moving--mother told me yesterday. I should think you would have gone to New York with him, or to Iberville with the children, rather than be bothered here with housekeeping.
"Since yesterday evening my fate has been sealed; to be loved by you or to die.
Do you mean he made your belle-soeur an offer yesterday?"
"I fancied something of the sort yesterday. Yes, if he went away early, and was out of humor too, it must mean it....