i Register
In some senses, knack is marked as obsolete, UK. Watch for register when choosing this word.
noun
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.
verb
To crack; to make a sharp, abrupt noise; to chink.
If they hear the Beads knack upon each other, that's enough.
To speak affectedly.
name
A surname.