Knack

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

2. To speak affectedly. [Prov. Eng.] Halliwell.

Knack, n. 1. A petty contrivance; a toy; a plaything; a knickknack.

A knack, a toy, a trick, a baby's cap.
Shak.

2. A readiness in performance; aptness at doing something; skill; facility; dexterity.

The fellow . . . has not the knack with his shears.
B. Jonson.

The dean was famous in his time,
And had a kind of knack at rhyme.
Swift.

3. Something performed, or to be done, requiring aptness and dexterity; a trick; a device. "The knacks of japers." Chaucer.

For how should equal colors do the knack !
Pope.