v. & n.
v. 1 tr. rub or scrape (a part of the body, esp. the skin) so as to break the surface without causing bleeding. 2 a tr. touch lightly in passing. b intr. (foll. by against, along, etc.) move with a light passing contact.
n. an act or instance of grazing.
[ perh. a specific use of GRAZE(1), as if 'take off the grass close to the ground' (of a shot etc.) ]