dial. In 7 tanck. [Echoic.] A blow, a knock (E.D.D.).
1686. Plot, Staffordsh., 30. The Operators in Iron are all awakened with a little blow (or tanck) upon a pair of their tongues (which is the common means they use for that purpose).
[1904. in Eng. Dial. Dict., from Yorksh. to Northampton and Worcestersh.]