(onom.) sound of dripping water, a ticking clock etc

strokes 14
strokes after radical 11
嘀嗒 嘀嗒 di1 da1
(onom.) tick tock

嘀咕 嘀咕 di2 gu5
to mutter; to feel apprehensive

犯嘀咕 犯嘀咕 fan4 di2 gu5
to hesitate; to have second thoughts; to be concerned; to brood (over sth); to complain