noun 1.the
sound of a rapid succession of light beats or taps, as of rain, footsteps, etc.
verb (used without object) 2.to produce or move with this sound: She pitter-pattered along the hallway.
adverb 3.with such a sound: to run pitter-patter through the house.
Origin:
1400–50; late Middle English: a babbled prayer; perhaps imitative