noun

• Certain members of the fish family Cyprinidae, including:

noun

• (US) A cockroach.
• (US, slang, smoking) The butt of a marijuana cigarette.
• (US, slang, smoking) An entire marijuana cigarette, blunt, or joint.
  "In his half hour of free time between brooms it was Willie's custom to smoke his lunch in an alleyway. He'd take just half a roach, only enough to make him feel a new day was starting, no more no less."
• (UK, slang, smoking) The filter of a rolled cigarette or joint, made from card or paper.
  "Last toke is the yellowing fabric of the roach, containing the stuff that is less than tobacco."

noun

• (nautical) Sail material that forms a concave curve rather than straight leech (aft edge) of a sail to increase the sail area over that of a simple triangular sail.

verb

• (transitive) To cut or shave off the mane of a horse so that the remaining hair stands up on the neck.
• (transitive, by extension) To cut a person's hair so that it stands straight up.