weaken

verbs

lessen the strength of
"The fever weakened his body"
weaken
is derived from
weakener
is derived from
weakening
antonym
strengthen
is a type of (narrower)
cause to change; make different; cause a transformation
"The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
alter, change, modify
causes
become weaker
"The prisoner's resistance weakened after seven days"
weaken
become weaker
"The prisoner's resistance weakened after seven days"
weaken
is derived from
weakening
antonym
strengthen
is a type of (narrower)
decrease in size, extent, or range
"The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"
decrease, diminish, fall, lessen
destroy property or hinder normal operations
"The Resistance sabotaged railroad operations during the war"
counteract, countermine, sabotage, subvert, undermine, weaken
reduce the level or intensity or size or scope of
"de-escalate a crisis"
de-escalate, step down, weaken
is derived from
weakener
lessen in force or effect
"soften a shock"; "break a fall"
break, damp, dampen, soften, weaken
is derived from
weakener