weak sister
noun
,
Informal.
1.
a vacillating person; coward.
2.
a part or element that undermines the whole of something; a weak link.
Origin
1855-60
Examples from the web for
weak sister
However, all of the daughters became rather strong and domineering themselves, with not a
weak sister
in the lot.
Being a
weak sister
she will readily yield te our persuasion.
Even riparian protection is a
weak sister
to this new context.
British Dictionary definitions for
weak sister
weak sister
noun
1.
(
US
,
informal
) a person in a group who is regarded as weak or unreliable
Slang definitions & phrases for
weak sister
weak sister
noun phrase
An unreliable person, esp a male
(1857+)