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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 ?
Her sister and the rest were a long time gone; and during their absence a voice (it appeared to be that of the gentleman with the black hair) was continually calling out through the music, 'One, two, three, four, five, six--go
And so, Amy,' said her sister, when the three together passed out at the door that had such a shame-faced consciousness of being different from other doors: the uncle instinctively taking Amy's arm as the arm to be relied on: 'so, Amy, you are curious about me?
A great many years ago--for the fifteenth century was scarce two years old at the time, and King Henry the Fourth sat upon the throne of England--there dwelt, in the ancient city of York, five maiden sisters, the subjects of my tale.
But, if the four elder sisters were lovely, how beautiful was the youngest, a fair creature of sixteen
God said that my sister must come first, but He put His hand on my mother's eyes at that moment and she was altered.
Celia blushed, and was unhappy: she saw that she had offended her sister, and dared not say even anything pretty about the gift of the ornaments which she put back into the box and carried away.
Thus Celia, mutely bending over her tapestry, until she heard her sister calling her.
He listened to her with silent attention, and on her ceasing to speak, rose directly from his seat, and after saying in a voice of emotion, "to your sister I wish all imaginable happiness; to Willoughby that he may endeavour to deserve her,"--took leave, and went away.
The two sisters brought all the six children successfully through it, but Kitty was no better in health, and in Lent the Shtcherbatskys went abroad.
Miss Amelia put the case before her sisters from the sternly conscientious point of view, at the opposite end of the room.
have a good dinner for his friends while he can pay for it," she said; "and he's a right to do as he likes in his own house, sister.
exclaimed my sister, pointing me out with her needle and thread, and shaking her head at me.
My dear sister," said Mary, "if you can persuade him into anything of the sort, it will be a fresh matter of delight to me to find myself allied to anybody so clever, and I shall only regret that you have not half a dozen daughters to dispose of.
It is enough for me to know that my letter to my sister has been turned into a trap to catch me, and that Mrs.
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.
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