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"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.
A telephone call •Chiefly in the expression give someone a tinkle (1938+)verb
To urinate; pee •A nursery use (1950+)