heartbeat - definition and synonyms

noun 

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/ˈhɑː(r)tˌbiːt/
singularheartbeat
pluralheartbeats
  1. 1
    [countable]

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    the movement or sound of your heart as it makes blood flow round your body

    The doctor listened to my heartbeat.

    an irregular heartbeat

  2. 2
    [singular] literary a moment