Definition of bow:

part of speech: adjective

Anything curved or arched, as a bow- window.

part of speech: noun

An act of respect by bending the body, or by inclining the head.

part of speech: verb

To bend; to bend the body in token of respect; to crush; to depress; to stoop.

part of speech: noun

An instrument for shooting arrows with; a name given to various instruments; the curved doubling of a ribbon or string in a slip- knot.