Definition

To sharpen; to make cold. [R.] Cold winter keens the brightening flood. Thomson.

Other Definitions

This word also has 2 other definitions:

KEEN (adjective)

1. Sharp; having a fine edge or point; as, a keen razor, or a razor with a keen edge. A bow he bare and arwes [arrows] bright and kene. Chaucer. That ...

KEEN (noun)

A prolonged wail for a deceased person. Cf. Coranach. [Ireland] Froude.