Weaken (verb)

To make weaker, reduce in strength or effectiveness.

Origin:

Middle english: from old norse veikna "become weak", from veikr "weak".

Examples:

1. The hurricane weakened as it moved inland.
2. The country's economy has been weakened by high inflation.
3. The drug is designed to weaken the immune system.
4. The athlete's injury weakened his performance.
5. The prolonged drought has weakened the crops.