PITAPAT
Source: 566, 567
pitapat. Pitapat, n. a flutter, a quick step; ad. in a flutter
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Pit″a‐pat′ (?), adv. [[An onomatopoetic reduplication of pat a light, quick blow.]] In a flutter; with palpitation or quick succession of beats. Lowell. “The fox's heart went pitapat.” L'Estrange.