- a sound as of quick light steps or taps（脚步、击打）劈劈啪啪声, 卜卜声：
the soft pitter-patter of the rain on the leaves
雨打在叶子上的柔和的劈啪声。
- with this sound劈劈啪啪地, 卜卜地：
footsteps that go pitter-patter.
劈劈啪啪的脚步声。
no obj.
- move with or make such a sound劈劈啪啪地移动; 发出劈劈啪啪的响声：
the rain pitter-pattered on my windows.
雨点噼里啪啦打落到窗户上。
词源
late Middle English: reduplication (expressing rhythmic repetition) of the verb PATTER1.