Rash(n.) A fine eruption or efflorescence on the body, with little or no elevation.
Rash(n.) An inferior kind of silk, or mixture of silk and worsted.
Rash(superl.) 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.