die off

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die off (third-person singular simple present dies off, present participle dying off, simple past and past participle died off)

1. To suffer a series of deaths; to die one by one; to progressively become extinct. (If a group of plants, animals, or people dies off, the entire group dies over a period of time.)

   Synonym: die out

2. To become defunct or nonexistent.

   Synonym: die out

   The student guitar club died off after a few years.

3. Of music, noise, etc., to reduce in volume until no longer audible.

   Synonym: die down