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weaken (v.)

late 14c., "to become feeble," from weak + -en (1). Transitive sense from 1560s. Related: Weakened; weakening.

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Definitions of weaken from WordNet

weaken (v.)
lessen the strength of;
The fever weakened his body
weaken (v.)
become weaker;
The prisoner's resistance weakened after seven days
weaken (v.)
destroy property or hinder normal operations;
Synonyms: sabotage / undermine / countermine / counteract / subvert
weaken (v.)
reduce the level or intensity or size or scope of;
Synonyms: de-escalate / step down
weaken (v.)
lessen in force or effect;
Synonyms: dampen / damp / soften / break
From wordnet.princeton.edu