Knack
/næk/
noun
A readiness in performance; aptness at doing something.
A petty contrivance; a toy.
Something performed, or to be done, requiring aptness and dexterity.
Synonyms: device, trick, dexterity, facility, skill, knickknack, plaything, toy
verb
To crack; to make a sharp, abrupt noise; to chink.
To speak affectedly.