weak sister definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ Slang one who is cowardly, unreliable, etc.
weak sister definition by American Heritage Dictionary
- A weak or undependable member of a group.
- A person regarded as timid or indecisive.