Heartbeat
/hˈɑˌrtbit/
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Definition
(noun) One pulsation of the heart; especially an irregular one, hence the emotion which causes it.
Sentence Examples
The doctor monitored the patient's heartbeat and blood pressure.
She laid her head on my chest so she could listen to my heartbeat.
CEFR Practice Quiz
The athlete's ____ gradually slowed down as he rested after the long and exhausting race.