flare up

verbs

ignite quickly and suddenly, especially after having died down
"the fire flared up and died down once again"
flare up
is a type of (narrower)
cause to start burning; subject to fire or great heat
"Great heat can ignite almost any dry matter"; "Light a cigarette"
ignite, light
erupt or intensify suddenly
"Unrest erupted in the country"; "Tempers flared at the meeting"; "The crowd irrupted into a burst of patriotism"
break open, burst out, erupt, flare, flare up, irrupt
is derived from
flare-up