
In a heartbeat
Emotional Intensity
Used to express a strong emotional response or desire to do something without delay.

If she called me for help, I'd be there in a heartbeat.
Informal Use
It's casual and mostly used in spoken English or informal writing, like text messages or emails between friends.

I'd join your band in a heartbeat, just ask!
Positive Scenarios
Often used when talking about an opportunity or an action someone highly favors or is excited about.

He'd adopt another puppy in a heartbeat if he could.
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