a vacillating person; coward.
a part or element that undermines the whole of something; a weak link.
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Origin of weak sister
First recorded in 1855–60
Words nearby weak sister
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for weak sister
US informal a person in a group who is regarded as weak or unreliable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012