From Longman Dictionary of Contemporary Englishfly off the handlefly off the handleinformalANGRY to suddenly get very angry Calm down – there’s no need to fly off the handle. → fly
Examples from the Corpus
fly off the handle• Linda called me back and apologized for flying off the handle.• He just flew off the handle.• Some people always fly off the handle, and often their anger is totally out of proportion to the problem in hand.• Lila flew off the handle and she realizes that.• If last night hadn't happened, would she still have flown off the handle, sooner or later ...? 