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know every trick in the book

To be aware of or knowledgeable in every possible way to do or achieve something, especially ways that are clever, cunning, or ethically questionable. My dad was a shrewd businessman who knew every trick in the book to seal a deal. If you want girls to be interested in you, my older brother knows every trick in the book.
See also: book, every, know, trick

know full well

To know or be aware of something without any possible doubt. You know full well why I'm upset with you, so there's no use playing dumb! We know full well that many families are struggling to make ends meet, but these tax increases are unavoidable.
See also: full, know, well

know (someone) in the biblical sense

To have (or have had) sexual intercourse with someone. In certain versions of the Bible, "to know someone" means to have sexual relations with him or her, as in Genesis 4:1: "And Adam knew Eve his wife, and she conceived and bore Cain." Bob: "You know Samantha quite well, right?" Dave: "Well, I don't know her in the biblical sense, if that's what you're asking." John is looking very well these days. I'd like to get to know him in the biblical sense, if you know what I mean.
See also: biblical, know, sense

(the) next thing (one) knows

All of a sudden; out of nowhere; without warning. I was standing in line, minding my own business, when the next thing I know, a gunman runs into the bank and starts screaming at us to get on the ground! Tammy had only been on a few dates with Mark, but this one had been going smoothly. Next thing she knew, he got on one knee and proposed to her.
See also: know, next, thing

know a hawk from a handsaw

To be able to tell two things apart. The phrase comes from Shakespeare's Hamlet. Of course I know which twin is which, I know a hawk from a handsaw, after all!
See also: hawk, know

know chalk from cheese

To be able to tell two things apart (especially by recognizing their differences). Of course I know which twin is which, I know chalk from cheese, after all! Leah has a beauty mark under her left eye, and Deena doesn't.
See also: chalk, cheese, know

know for a fact

To have definitive knowledge of something. I know for a fact that he cheats in cards! I saw the ace up his sleeve. My mom says she knows for a fact that I'm getting the internship at her company, but I won't believe it until the recruiter calls me.
See also: fact, know

know (something) inside and out

To be well-versed in and/or very familiar with something. I'm ready for this exam—I know genetics inside and out! I think Mary will do great at the audition, now that she knows the dance inside and out. These cabbies know the city streets inside and out.
See also: and, inside, know, out

know (one's) beans

To be knowledgable about and/or very familiar with something. I had no idea you were such a good piano player—you really know your beans!
See also: bean, know

know (someone)

To have a familiarity with someone; to know who someone is. Such familiarity can range from close friendship to having only met someone once. Oh yeah, I know Mr. Meyers, he used to be my neighbor. He knew Vanessa long before she became a famous singer.
See also: know

know what's o'clock

To be attentive and aware of all that is going on. Those students thought they could get away with cheating in my class, huh? Too bad I know what's o'clock!
See also: know

know which way the wind blows

To be able to anticipate how a certain course or situation is likely to develop. These politicians know which way the wind blows regarding public opinion on the issue, and you can bet they'll vote accordingly.
See also: blow, know, way, wind

knew it was coming

 and (had) known it was coming
to have expected in advance that something was to happen. I shouldn't act surprised. I knew it was coming. It's his own fault. He should have known it was coming.
See also: coming, knew

If I knew you were coming, I'd have baked a cake

An expression of delighted surprise at finding someone whose appearance was unanticipated. The title of a 1950 hit record by Eileen Barton, the phrase quickly caught on, and for at least a decade thereafter anyone who appeared where least expected was likely to be greeted with “If I knew you were coming, I'd have baked a cake.”
See also: baked, cake, have, if, knew
References in classic literature ?
Therese knew her way about very well already and preferred to be left to herself.
a game to him, and the one game he knew that was always exciting, always full of danger and of drama, I could just then have found it in my heart to try the game myself
The effect was to drive all he knew out of Philip's head, and he looked at the printed page vacantly.
This, too, sank to Jerry's heart, adding weight to his sure intuition that dire fate, he knew not what, was upon him.
She smiled forgiveness through her wet eyes, and though he knew of nothing for which to be forgiven, he melted utterly.
In the day I saw thee a coward; in the night, when all men fought, even the boys not yet hunters, I saw thee not and knew thee doubly a coward.
MENO: O Socrates, I used to be told, before I knew you, that you were always doubting yourself and making others doubt; and now you are casting your spells over me, and I am simply getting bewitched and enchanted, and am at my wits' end.
I never knew Matthew very well; he was so shy we boys couldn't get acquainted with him--but I quite agree with you that Captain Jim is one of the rarest and finest souls God ever clothed in clay.
In truth, in truth, Monsieur Darzac knew the murderer so well that --while wishing to kill him himself--he was afraid I should find him.
I never knew any one that did have, only the Whites--they're some rich.
I am glad, too," said Dolly, faintly smiling, and trying by the expression of Anna's face to find out whether she knew.
If something like this had happened after we had been married half a dozen years and really knew each other, we could laugh at it.
Jukes only knew that the arm was gone off his shoulders.
Here was a perplexity that I had not indeed skill to manage myself in, neither knew I what course to take.
She put her hands to her dress, as if she hardly knew.