Emily Dickinson Lexicon

KNACK, n. [nak.]

1. A little machine; a petty contrivance; a toy. A knack, a toy, a trick, a baby's cap. – Shak.
2. A readiness; habitual facility of performance; dexterity; adroitness. My author has a great knack at remarks. – Atterbury. The Dean was famous in his time, / And had a kind of knack at rhyme. – Swift.
3. A nice trick. For how should equal colors do the knack? / Chameleons who can paint in white and black? – Pope.