WordWeb Online

1. Diminish in size, scope, or intensity
   "The war of words between them de-escalated with time"
    
2. Reduce the level or intensity or size or scope of
   "de-escalate a crisis"
   - weaken, step down

Derived forms: de-escalating, de-escalates, de-escalated

See also: de-escalation

Type of: decrease, diminish, fall, lessen, minify

Antonym: escalate