'down-bow' definitions:

Definition of 'down-bow'

(from WordNet)
noun
A downward stroke from the heel to the tip of the bow

Definition of 'down-bow'

From: GCIDE
  • down-bow \down-bow\ n. (Music) a downward stroke from the heel to the tip of the bow, in bowing a stringed instrument. Contrasted with up-bow, when the bow is moved in the opposite direction. [WordNet 1.5 +PJC]