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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

Said of people who 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

(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 ?
One solid stationary point in the looseness of this gentleman's character was, that he respected and admired his sister Amy.
When this spirited young man and his sister had begun systematically to produce the family skeleton for the overawing of the College, this narrative cannot precisely state.
The sisters saluted the holy man with becoming reverence, and the eldest motioned him to a mossy seat beside them.
The monk answered not, save by a grave inclination of the head, and the sisters pursued their task in silence.
But how can I wear ornaments if you, who are the elder sister, will never wear them?
like those, Dorothea," said Celia, rather falteringly, beginning to think with wonder that her sister showed some weakness, and also that emeralds would suit her own complexion even better than purple amethysts.
And saying these words she glanced at her sister, and seeing that Dolly sat silent, her head mournfully bowed, Kitty, instead of running out of the room as she had meant to do, sat down near the door, and hid her face in her handkerchief.
The sisters drew back horror-struck into the furthest corner of the room.
Glegg, with a bitter smile and a scarcely perceptible toss of her head, "I should ha' thought you'd known your own sister better.
I am cut to the heart; but I have no angry feeling toward my sister.
When I reached London I did hear how my sister died, but still I was afraid.
The real state of things between Willoughby and her sister was so little known to herself, that in endeavouring to explain it, she might be as liable to say too much as too little.
exclaimed my sister, as if she didn't quite mean that, but rather the contrary.
Dinarzade replied that she would do with pleasure what her sister wished.
He could allow his sister to be the best judge of her own happiness, but he was not pleased that her happiness should centre in a large income; nor could he refrain from often saying to himself, in Mr.