1.any red eruption of the skin
2.a series of unexpected and unpleasant occurrences;
a rash of bank robberies
3.imprudently incurring risk;
do something rash that he will forever repent- George Meredith
4.marked by unthinking boldness; with defiant disregard for danger or consequences;
foolhardy enough to try to seize the gun from the hijacker