the world > physical sensation > hearing and noise > degree, kind, or quality of sound > repeated sound or succession of sounds > [adjective] > pattering or spattering (6)
That spatters, in senses of the verb.
transferred and figurative: cf. babbling, adj.; sometimes = ‘tell-tale’.
That makes a rapid succession of light taps or similar sounds.
Of the nature of, or characterized by, rapidly alternating or repeated light sounds; that palpitates or patters.
That patters or makes a repeated light tapping sound.