(nonstandard) plural of sister-in-law

(chiefly US, idiomatic, derogatory) A person who is cowardly or indecisive. / (chiefly US, idiomatic) A person or thing which is the least robust or least dependable member of a group.

plural of half-sister

plural of weak sister

colleague ("sister" in the same craft, occupation, or society) / (India) One's spouse's sibling's wife.

plural of co-sister

A sister by birth. / A female bound to another one in commitment and friendship by a ceremonial mingling of blood.

plural of sister city

plural of sister ship

plural of big sister