pitter-patter
Word family  verbpitteradverbpitter-patter
pit·ter-pat·ter /ˈpɪtə ˌpætə $ ˈpɪtər ˌpætər/ adverbadv literary  SOUNDwith quick light beats or steps  噼噼啪啪地,噗噗地 Anna’s heart went pitter-patter as she opened the letter. 安娜打开信时心怦怦直跳。
   —pitter-patter noun [singular] the pitter-patter of small feet running up the stairs 小脚丫奔上楼梯的噼啪声
   (1400-1500) From the sound