Definition of die-off in English:

die-off

Syllabification: die-off

Entry from US English dictionary

noun

1A period in which a significant proportion of a population dies naturally, usually within a short time.
1.1A process causing this.
1.2The death of a significant proportion of a population in this way.

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Pronunciation: kənˈspɪkjʊəs
adjective
clearly visible