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heartbeat /ˈhɑɚtˌbiːt/  

  • noun
    plural -beats
    [count] :the action or sound of the heart as it pumps blood
    The patient had a rapid heartbeat.
    in a heartbeat
    US informal :in a very brief time :without any delay or hesitation
    Even though the job was difficulthe says he'd agree to do it again in a heartbeat.