Weak Sister Definition
noun
One who is cowardly, unreliable, etc.
Webster's New World
An ineffective or undependable member of a group.
American Heritage
A person regarded as timid or indecisive.
American Heritage
(chiefly US, idiomatic) A person or thing which is the least robust or least dependable member of a group.
Wiktionary
Other Word Forms of Weak Sister
Noun
Singular:
weak sister
Plural:
weak-sisters
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