Etymology
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pit-a-pat (adv.)

also pitter-pat, 1520s; imitative. As a noun from 1580s.

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Definitions of pit-a-pat

pit-a-pat (adv.)
as of footsteps;
he came running pit-a-pat down the hall
Synonyms: pitty-patty / pitty-pat / pitter-patter
pit-a-pat (adv.)
describing a rhythmic beating;
his heart went pit-a-pat
Synonyms: pitty-patty / pitty-pat / pitter-patter
From wordnet.princeton.edu