flare–up

1 ENTRIES FOUND:
flare–up /ˈfleɚˌʌp/ noun
plural flare–ups
flare–up
/ˈfleɚˌʌp/
noun
plural flare–ups
Britannica Dictionary definition of FLARE–UP
[count]
1 
: a sudden occurrence of flame
2 
: a sudden occurrence or expression of anger
3 
: an occurrence in which something (such as violence or a disease) suddenly begins or becomes worse