Meaning of “die down” - Learner’s Dictionary

die down

phrasal verb with die uk us /daɪ/ verb (present participle dying, past tense and past participle died)

If something, especially noise or excitement, dies down, it gradually becomes less loud or strong until it stops:

She waited for the laughter to die down before she spoke.

(Definition of “die down” from the Cambridge Learner’s Dictionary © Cambridge University Press)