tinkle (v.)youdaoicibaDictYouDict[tinkle 词源字典]
"to make a gentle ringing sound," late 14c., possibly a frequentative form of tinken "to ring, jingle," perhaps of imitative origin. Meaning "to urinate" is recorded from 1960, from childish talk. Related: Tinkled; tinkling. As a noun from 1680s.[tinkle etymology, tinkle origin, 英语词源]