Noah Webster
Knack
KNACK, noun nak. A little machine; a petty contrivance; a toy.
A knack a toy, a trick, a baby's cap.
1. A readiness; habitual facility of performance; dexterity; adroitness.
My author has a great knack at remarks.
The Dean was famous in his time,
And had a kind of knack at rhyme.
2. A nice trick.
For how should equal colors do the knack?
Cameleons who can paint in white and black?
KNACK, verb intransitive nak. To crack; to make a sharp abrupt noise. [Little Used.]