weak sister(redirected from weak sisters)
Also found in: Financial.
n. Often Offensive
1. An ineffective or undependable member of a group.
2. A person regarded as timid or indecisive.
informal US a person in a group who is regarded as weak or unreliable
1. a vacillating person; coward.
2. a part or element that undermines the whole of something; weak link.