5. (Billiards)
Defn: A shot which scores by chance and not as intended by the player; a fluke. [Cant, U.S.] Scratch cradle. See Cratch cradle, under Cratch. — Scratch grass (Bot.), a climbing knotweed (Polygonum sagittatum) with a square stem beset with fine recurved prickles along the angles. — Scratch wig. Same as Scratch, 4, above. Thackeray.
SCRATCH
Scratch, a.
Defn: Made, done, or happening by chance; arranged with little or no preparation; determined by circumstances; haphazard; as, a scratch team; a scratch crew for a boat race; a scratch shot in billiards. [Slang] Scratch race, one without restrictions regarding the entrance of competitors; also, one for which the competitors are chosen by lot.
SCRATCHBACK
Scratch"back`, n.
Defn: A toy which imitates the sound of tearing cloth, — used by drawing it across the back of unsuspecting persons. [Eng.]
SCRATCHBRUSH
Scratch"brush`, n.
Defn: A stiff wire brush for cleaning iron castings and other metal.
SCRATCH COAT
Scratch" coat`.
Defn: The first coat in plastering; — called also scratchwork. See
Pricking-up.