Webster's Revised Unabridged Dictionary · 1913

Brash

Brash (brash) , adjective

[Compare Gael. bras or German barsch harsh, sharp, tart, impetuous, Dutch barsch, Swedish & Danish barsk.]

Hasty in temper; impetuous. — Grose

Brash , adjective

[Compare Amer. bresk, brusk, fragile, brittle.]

Brittle, as wood or vegetables. [Colloquial, United States] — Bartlett

Brash , noun

[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. [Provincial English] — Wright
3.
(Geology) Broken and angular fragments of rocks underlying alluvial deposits. — Lyell
4.
Broken fragments of ice. — Kane
Collocations (2)
Water brash (Medicine) , 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 (Medicine) , a severe form of diarrhea which sometimes attacks children just weaned.