American Heritage Dictionary
(2)
Century Dictionary
GNU Webster's 1913
(2)
WordNet
(5)
Elsewhere on the web
It's contrast, among other things, that makes people's heart go pitter-patter.— BiggerPockets Forums
Izumi bullies Tomo whenever he's around - why does it make Tomo's heart go pitter-patter?— Manga Maniac Cafe
At length there was a pitter-patter, pitter-patter, and some bits of mortar fell from the wall above.— The Great Big Treasury of Beatrix Potter
Every door was banging, and the passages and the staircase resounded with the constant pitter-patter of feet.— The Three Cities Trilogy, Complete Lourdes, Rome and Paris
Who else felt interest in such pitter-patter?— The Verse-Book of a Homely Woman

American Heritage Dictionary (1)
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