have a cow

have a cow  (American)

to be very worried, upset, or angry about something I thought he was going to have a cow when I told him I'd lost his key.

See also: cow, have

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have a cow

to be very worried, upset, or angry about something The record companies were having a cow over downloadable music files.

Usage notes: the opposite meaning is expressed by don't have a cow: Don't have a cow, Mom, I'll clean up my room.

See also: cow, have