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Weak stomach muscles can lead to back problems.
He has always had a weak heart.
They can always improve by working on their weak points.
The report was criticized for being weak on detail.
The floorboards are weak in some places.
a weak gravitational field
The case is weak because it is based on very little real evidence.
He gave a very weak excuse for not being on time.
They were on weak ground, with no precedents for their action.
They exploited the weak points in their opponents' defenses.
This is the American English definition of weak. View British English definition of weak.