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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
weak sister
 
n
informal (US) a person in a group who is regarded as weak or unreliable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Weak sister is always a great word to know.
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a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Slang Dictionary

weak sister definition


  1. n.
    a timid person, usually a male. : Another weak sister and we'll have to quit. We've got to pull together.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Example sentences
Being a weak sister she will readily yield te our persuasion.
However, all of the daughters became rather strong and domineering themselves, with not a weak sister in the lot.
Even riparian protection is a weak sister to this new context.
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