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
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.
Being a weak sister she will readily yield te our persuasion.