heartbeat
nounUK /ˈhɑːt.biːt/
US /ˈhɑːrt.biːt/
The beat you feel when your heart pumps blood.
The doctor listened to the baby's heartbeat.
OTHER MEANINGS
2. A single complete cycle of the heart's pumping action.
Her heartbeat was steady and strong.
3. A very short moment of time.
I'll be there in a heartbeat.
4. The rhythmic sound made by the heart.
He could hear his own heartbeat in the quiet room.