intransitive. Of rain, snow, lightning, etc.: to come down from the sky. Also of fog or mist: to settle, descend.

To emit and let fall in drops. intransitive. Of rain, snow, etc.: To fall. Obsolete.

intransitive. Scottish. Of rain, snow, hail, etc.: to fall very heavily or persistently; to pour or beat down. Cf. to ding down 2 at phrasal verbs 1.