in a heartbeat
phrase
US, informal
: in a very brief time : without any delay or hesitation
Even though the job was difficult, he says he'd agree to do it again in a heartbeat.
Cite this Entry
“In a heartbeat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20a%20heartbeat. Accessed 12 Mar. 2026.
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