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A weak, spineless, unreliable, or ineffectual person within a group or team. Don't worry, we reassigned him. The last thing we need right now is some weak sister dragging this case down. I knew everyone on the team thought of me as something of a weak sister, so I spent the whole off-season training and practicing.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a timid person, usually a male. It looks like Dave is the weak sister on the team. We've got to pull together and stop playing like a bunch of weak sisters.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
n. a timid person, usually a male. Another weak sister and we’ll have to quit. We’ve got to pull together.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.