Other forms: rashes
A rash is the patch of red itchy spots that suddenly appears on skin. Come out in a rash, an allergic rash, a nettle rash.
A rash that does not fade under pressure is the one to worry about, which is the glass test taught for meningitis. Most are harmless and go by themselves. Figuratively a rash of something means a sudden outbreak. Note the adjective rash, meaning reckless, which is a different word.
1nounrashA patch of red itchy spots on the skin.
“The baby had a red rash on her cheeks after trying strawberries for the first time.”
2adjectiverecklessReckless and hasty.
“Don't make any rash decisions while you're still angry.”
rash is a skin condition.
The adjective rash, meaning hasty, comes from Old English. The noun for the skin condition is a separate French word.
Proto-Indo-European
*Hreth₂- — to run, roll
Proto-Germanic
*raskaz
Proto-West Germanic
*rask
Old English
*ræsċ — rash
Middle English
rash
English, today
rash
Built from
The adjective is derived from Middle English rash, rasch (“hasty, headstrong, rash”)rashe, rassh, rasshe, probably from Old English ræsċ (“rash”) (found in derivatives such as ræsċan (“to move rapidly; to flicker; to flash; to glitter; to quiver”), ræsċettan (“to crackle, sparkle”), etc.), from Proto-West Germanic rask, raskī, rasku, from Proto-Germanic raskaz, raskuz, raþskaz, raþskuz (“rash; rapid”), from Proto-Indo-European Hreth₂- (“to run, roll”). The Middle English word was probably influenced by the cognates listed below. The adverb is derived from Middle English rashe (“quickly, rapidly”), from rash, rasch (see above). 2
Etymology from Wiktionary, CC BY-SA