weaken

verb

1. 1

   become weaker

   The prisoner's resistance weakened after seven days

2. 2

   lessen the strength of

   The fever weakened his body

3. 3

   reduce the level or intensity or size or scope of

   de-escalate a crisis

4. 4

   lessen in force or effect

   soften a shock

   break a fall

5. 5

   destroy property or hinder normal operations

   The Resistance sabotaged railroad operations during the war