Meaning of “drop like flies” in the English Dictionary

british dictionary

"drop like flies" in British English

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drop like flies

informal

If people are dropping like flies, they are dying or falling down in large numbers:

The heat was overwhelming and people were dropping like flies.

to stop doing an activity in large numbers:

There used to be over 20 of us in our aerobics class but they're dropping like flies.

(Definition of “drop like flies” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)