to shine or blaze with a sudden flame

a match flared in the darkness

(usu + up) to become suddenly angry

flare up at the slightest provocation

(usu + up) said of violence, etc: to break out

Fighting flared up again

(usu + out) said of trousers, a skirt, sleeves, etc: to get wider towards the hem

said of the nostrils: to widen, e.g. as a sign of anger; to dilate

to cause (something, esp one's nostrils) to widen

to ignite and burn off (waste gas, etc)

a sudden unsteady glaring light or flame

a device producing a very bright fire or blaze of light, used to signal, illuminate, or attract attention, or a device used to produce this

a sudden outburst, esp of anger

a temporary outburst of gas and radiation from a small area of the sun's surface. Also called solar flare energy, e.g.:

a flame, usu at the top of a stack, that burns off unwanted gas at an oil refinery or oil well

a gradual widening of a skirt, trouser leg, sleeve, etc towards the hem

an area of flushed skin surrounding an inflamed or raised area

in photography, light resulting from reflection, e.g. between lens surfaces, or a fogged area on a negative resulting from this