A readiness in performance; aptness at doing a specific task; skill; aptitude; facility; dexterity; -- often used with for; as, a knack for playing the guitar.
“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.
“For how should equal colors do the knack !”
— Pope.