knack

A readiness in performance; aptness at doing something.

• These men had some uncanny knack of knowing when the steel was right, and like many such things, it just could not be put into a textbook on the subject.
• The sophist runs for cover to the darkness of what is not and attaches himself to it by some knack of his;

A petty contrivance; a toy.

Something performed, or to be done, requiring aptness and dexterity.

To crack; to make a sharp, abrupt noise; to chink.UKdialectalobsolete

• If they hear the Beads knack upon each other, that's enough.

To speak affectedly.