I’ve seen people (entirely in computing contexts) say “used in anger” but never knew the derivation. See eg https://en.m.wiktionary.org/wiki/fire_in_anger#Verb

I’ve seen people (entirely in computing contexts) say “used in anger” but never knew the derivation. See eg https://en.m.wiktionary.org/wiki/fire_in_anger#Verb https://en.m.wiktionary.org/wiki/fire_in_anger#Verb