[v] become weaker; "The prisoner's resistance weakened after seven days"
[v] lessen the strength of; "The fever weakened his body"
[v] reduce the level or intensity or size or scope of; "de-escalate a crisis"
[v] lessen in force or effect; "soften a shock"; "break a fall"
[v] destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"