Definition of arch:

part of speech: adjective

Chief of the first class.

part of speech: verb

To cover with an arch; to form an arch.

part of speech: noun

The circular part of any building; the hollow or concave part of a bridge or gateway.

part of speech: adjective

Waggish; mirthful.

Usage examples:

Word of the day

pin money

Money allowed to a wife for her private expenses. ...