in a heartbeat

Prepositional phrase

idiomatic

(idiomatic) Without hesitation or reservation; at once.

Japanese Meaning

ためらいなくすぐに / 即座に / 一瞬で / 瞬時に

If you needed me, I'd be there in a heartbeat.

もし君が私を必要としたら、私はためらうことなくそこに行くよ。

Sense（1）

(idiomatic) Without hesitation or reservation; at once.

“Colgate would sell Princess House in a heartbeat, if it could find a buyer,” said Bonita Austin.