weak sister
noun Informal.
a vacillating person; coward.
a part or element that undermines the whole of something; a weak link.
Origin of weak sister
First recorded in 1855–60
Words nearby weak sister
weak moment, in a,
weak nuclear force,
weak safety,
weak sauce,
weak side,
weak sister,
weak-headed,
weak-kneed,
weak-minded,
weak-willed,
weaken
British Dictionary definitions for weak sister
weak sister
noun
US informal
a person in a group who is regarded as weak or unreliable