Medical Dictionary
1flare
vi \ˈfla(ə)r, ˈfle(ə)r\
flaredflar·ing
Medical Definition of FLARE
: to break out or intensify rapidly : become suddenly worse or more painful—often used with up <your gallstones flare up—W. A. Nolen>
Seen & Heard
What made you want to look up flare? Please tell us where you read or heard it (including the quote, if possible).