in a heartbeat
Without hesitation or reservation; at once.
“Colgate would sell Princess House in a heartbeat, if it could find a buyer,” said Bonita Austin.
ADJ
irregular, regular
racing
After running up the stairs, his racing heartbeat slowly returned to normal.
VERB + HEARTBEAT
monitor | feel
PHRASES
the sound/thud of a heartbeat
She listened carefully to the sound of his heartbeat through the stethoscope.