Knack

(v. i.) To crack; to make a sharp, abrupt noise to chink.

Knack - Other Definitions

(v. i.) To crack; to make a sharp, abrupt noise to chink.
(v. i.) To speak affectedly.
(n.) A petty contrivance; a toy; a plaything; a knickknack.
(n.) A readiness in performance; aptness at doing something; skill; facility; dexterity.
(n.) Something performed, or to be done, requiring aptness and dexterity; a trick; a device.