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blood sister

A girl or woman who has sworn loyalty to another despite not being biologically related. Sally and Rita are such good friends, you rarely see one without the other. They're blood sisters.
See also: blood, sister

older sister

A female who is older than one or more of her siblings. I'll ask my older sister to help us with the move. Connie's older sister will be there on Saturday, and I'd really like you to meet her. Our neighbor Jill was like an older sister to me when I was growing up.
See also: older, sister

sisters before misters

slang An expression said among female friends as a reminder that their friendship is more important than relationships/interactions with men. Come on, don't ditch us for that guy you just met! Sisters before misters!
See also: before, mister, sister

younger sister

One's younger female sibling. Yeah, I have a younger sister—her name is Jill. Bella is Johnny's younger sister.
See also: sister, young

be (all) brothers/sisters under the skin

Of two or more people, to have thoughts or feelings in common, despite other obvious differences between them. As much as you dislike your chatty new co-worker, she's as nervous and insecure as you are—you're really sisters under the skin.
See also: brother, sister, skin

sob sister

1. A writer or journalist who keeps an advice column in a newspaper to answer readers' problems or quandaries. Collins worked as a sob sister for her local newspaper for several years before moving on to a permanent position with the New York Times.
2. A writer or journalist who focuses on or specializes in overly emotional, dramatic, or sentimental articles. They hired me as a sob sister to write about the plights of those in need of charity around the city.
3. A girl or woman who is prone to overly emotional pleas, complaints, or outbursts. It's a very difficult and narrow path to tread as a woman in the business world. If you show any emotional vulnerability, you are considered a sob sister, but if you allow nothing to show through, you're seen as some stuck-up ice queen—there's just very little in the way of a middle ground. There's this sob sister in my group who just drains all my energy with her constant complaining and whining.
See also: sister, sob

soul sister

1. An African-American woman, especially one who strives to better the lives of other African-Americans. It makes me proud, after so many years of pushing for greater representation in leadership, that a soul sister has finally been elected to our state congress.
2. A woman with whom one shares an intense, intimate, emotional connection. Janet has always been a soul sister to me, and over the course of our 20-year friendship, I feel like I've gotten to know her better than anyone else. When I got my first acting gig at 18, I was just a scared, cocky kid. I connected with Sarah on set, and she became my soul sister, taking me under her wing and teaching me what it meant to be a woman.
See also: sister, soul

(soul) sister

a black person's female, black friend. Many of the top singing groups of the '60s featured soul sisters.

weak sister

a timid person, usually a male. It looks like Dave is the weak sister on the team. We've got to pull together and stop playing like a bunch of weak sisters.
See also: sister, weak

be (all) brothers/sisters under the ˈskin

be men/women with similar feelings, in spite of outside appearances, position, etc: Actors and politicians are brothers under the skin. They both need public approval.
See also: brother, sister, skin


1. n. a (female) friend. (Originally underworld. Sometimes a term of address.) Come here, sister. I gotta have a word with you.
2. n. a fellow sorority member. One of my sisters let me borrow her car.
3. n. a fellow feminist. We can do this thing, sisters, we can do it!
4. Go to (soul) sister.

sob sister

n. a weak woman who is prone to crying. I had another sob sister in the office today. Went through half a box of tissues.
See also: sister, sob

(soul) sister

n. a black person’s female, black friend. (see also sister.) One of the soul sisters dropped by to talk.
See also: sister, soul



weak sister

n. a timid person, usually a male. Another weak sister and we’ll have to quit. We’ve got to pull together.
See also: sister, weak

sob sister

Someone devoted to charities, or (less charitably) a do-gooder. Originally a newspaper reporter or editor, invariably a woman, whose assignment was to produce sentimental stories and interviews that would appeal to female readers. By extension, the phrase came to mean any overly emotional person, whether male or female, especially one involved in charitable and public service efforts where sad tales of the recipients would tug on their heartstrings.
See also: sister, sob
References in classic literature ?
The house of the five sisters stood where it did, and the same trees cast their pleasant shade upon the orchard grass.
Again he paused near the sisters' house, and again he entered by the postern.
"No, dear, no," said Dorothea, stroking her sister's cheek.
There was a strong assumption of superiority in this Puritanic toleration, hardly less trying to the blond flesh of an unenthusiastic sister than a Puritanic persecution.
That humiliation of which she was always conscious came back to her with a peculiar bitterness when her sister reminded her of it.
Miss Amelia put the case before her sisters from the sternly conscientious point of view, at the opposite end of the room.
"Oh dear, there's no fear but what they'll be all here in time, sister," said Mrs.
Her next question and your next answer informed me that this person was a friend of my sister's, who felt a strong interest in her, and who knew that you had just returned from a visit to Norah.
As she sat now, with the letter in her hands, her thoughts went back to her sister, Jennie, who had been this child's mother, and to the time when Jennie, as a girl of twenty, had insisted upon marrying the young minister, in spite of her family's remonstrances.
He would have found it amply in that gallant brother and that dainty sister, so steeped in mean experiences, and so loftily conscious of the family name; so ready to beg or borrow from the poorest, to eat of anybody's bread, spend anybody's money, drink from anybody's cup and break it afterwards.
I clung to it every morning; I would not look when my sister shook her head at it, but long before each day was done I too knew that it could never be.
Impatient in this situation to be doing something that might lead to her sister's relief, Elinor resolved to write the next morning to her mother, and hoped by awakening her fears for the health of Marianne, to procure those inquiries which had been so long delayed; and she was still more eagerly bent on this measure by perceiving after breakfast on the morrow, that Marianne was again writing to Willoughby, for she could not suppose it to be to any other person.
"What's the matter now?" repeated my sister, more sharply than before.
"My dear sister; I want your help in a very important affair.
She was too indolent even to accept a mother's gratification in witnessing their success and enjoyment at the expense of any personal trouble, and the charge was made over to her sister, who desired nothing better than a post of such honourable representation, and very thoroughly relished the means it afforded her of mixing in society without having horses to hire.