in a heartbeat

Definition of in a heartbeat

US, informal

  1. :  in a very brief time :  without any delay or hesitation Even though the job was difficult, he says he'd agree to do it again in a heartbeat.

Word by Word Definitions

  1. :  one complete pulsation of the heart

    :  the vital center or driving impulse

    :  a brief space of time :  flash

Seen and Heard

What made you want to look up in a heartbeat? Please tell us where you read or heard it (including the quote, if possible).


capable of being understood in two ways

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