To lose your temper is to stop controlling your anger. The voice goes up, the door goes bang, and everybody in the kitchen goes quiet.
The possessive changes with the person — he lost his, I lost mine. It takes with about the person: she lost her temper with the driver. Keep your temper is the opposite half, and a short temper is the standing condition rather than the single event. Lose it on its own says the same thing more bluntly, and lose your rag is the informal British version.
1phraselose your temperTo stop controlling your anger.
“Try not to lose your temper with them again.”
lose your temper is an outburst of anger.
Practised in Common Word Pairs