\Brash\, a. [Cf. Gael. bras or G. barsch harsh, sharp,
tart, impetuous, D. barsch, Sw. & Dan. barsk.]
Hasty in temper; impetuous. --Grose.

\Brash\, a. [Cf. Amer. bresk, brusk, fragile, brittle.]
Brittle, as wood or vegetables. [Colloq., U. S.] --Bartlett.

\Brash\, n. [See {Brash} brittle.]
1. A rash or eruption; a sudden or transient fit of sickness.

2. Refuse boughs of trees; also, the clippings of hedges.
   [Prov. Eng.] --Wright.

3. (Geol.) Broken and angular fragments of rocks underlying
   alluvial deposits. --Lyell.

4. Broken fragments of ice. --Kane.

{Water brash} (Med.), an affection characterized by a
   spasmodic pain or hot sensation in the stomach with a
   rising of watery liquid into the mouth; pyrosis.

{Weaning brash} (Med.), a severe form of diarrhea which
   sometimes attacks children just weaned.