pitter-patter
adverbNAmE//ˈpɪt̮ər ˌpæt̮ər//
(also pit-a-pat, pitter-pat) I could hear the pitter-patter of feet in the corridor.See pitter-patter in the Oxford Advanced Learner's Dictionary
Check pronunciation: pitter-patter
Definition of pitter-patter adverb from the Oxford Advanced American Dictionary