weaken

Verb

• lessen in force or effect
  • soften a shock
    
  • break a fall
    

• reduce the level or intensity or size or scope of
  • de-escalate a crisis
    

• destroy property or hinder normal operations
  • The Resistance sabotaged railroad operations during the war
    

• become weaker
  • The prisoner's resistance weakened after seven days
    

• lessen the strength of
  • The fever weakened his body
    

Related words

• Synonyms: 
  dampen , damp , soften , break , de-escalate , step down , sabotage , undermine , countermine , counteract , subvert
• Antonyms: 
  escalate , intensify , step up , strengthen , beef up , fortify