see: think II. noun Etymology: imitative Date: 1947 a flat hollow sound, III. intransitive verb Date: 1949 to produce a flat hollow sound ; make a ~
THUNK
Meaning of THUNK in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012