Rash (răsh), v. t. [For arace.] 1. To pull off or pluck violently. [Obs.]

2. To slash; to hack; to cut; to slice. [Obs.]

Rashing off helms and riving plates asunder.

Rash, n. [OF. rasche an eruption, scurf, F. rache; fr. (assumed) LL. rasicare to scratch, fr. L. radere, rasum, to scrape, scratch, shave. See Rase, and cf. Rascal.] (Med.) A fine eruption or efflorescence on the body, with little or no elevation.

Canker rash. See in the Vocabulary. -- Nettle rash. See Urticaria. -- Rose rash. See Roseola. -- Tooth rash. See Red-gum.

Rash, n. [Cf. F. ras short-nap cloth, It. & Sp. raso satin (cf. Rase); or cf. It. rascia serge, G. rasch, probably fr. Arras in France (cf. Arras).] An inferior kind of silk, or mixture of silk and worsted. [Obs.] Donne.

Rash, a. [Compar. Rasher (-ẽr); superl. Rashest.] [Probably of Scand. origin; cf. Dan. & Sw. rask quick, brisk, rash, Icel. röskr vigorous, brave, akin to D. & G. rasch quick, of uncertain origin.] 1. Sudden in action; quick; hasty. [Obs.] "Strong as aconitum or rash gunpowder." Shak.

2. Requiring sudden action; pressing; urgent. [Obs.]

I scarce have leisure to salute you,
My matter is so rash.

3. Esp., overhasty in counsel or action; precipitate; resolving or entering on a project or measure without due deliberation and caution; opposed to prudent; said of persons; as, a rash statesman or commander.

4. Uttered or undertaken with too much haste or too little reflection; as, rash words; rash measures.

5. So dry as to fall out of the ear with handling, as corn. [Prov. Eng.] Grose.

Syn. -- Precipitate; headlong; headstrong; foolhardy; hasty; indiscreet; heedless; thoughtless; incautious; careless; inconsiderate; unwary. -- Rash, Adventurous, Foolhardy. A man is adventurous who incurs risk or hazard from a love of the arduous and the bold. A man is rash who does it from the mere impulse of his feelings, without counting the cost. A man is foolhardy who throws himself into danger in disregard or defiance of the consequences.

Was never known a more adventurous knight.

Her rash hand in evil hour
Forth reaching to the fruit, she plucked, she eat.

If any yet be so foolhardy
To expose themselves to vain jeopardy;
If they come wounded off, and lame,
No honor 's got by such a maim.

Rash (răsh), v. t. To prepare with haste. [Obs.] Foxe.