KNACK

knack. Knack, v. to bite, make a quick noise, talk fine

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Knack (năk), v. i. [[Prob. of imitative origin; cf. G. knacken to break, Dan. knage to crack, and E. knock.]] 1. 1. To crack; to make a sharp, abrupt noise to chink. Bp. Hall.
2. 2. To speak affectedly. Halliwell.