Synonyms for Lose one's cool:

• v.

  •become insane (verb)
  • go crazy.
  •freak out (verb)
  • blow a gasket,
  • wig out,
  • hit the ceiling,
  • go ballistic,
  • flip out,
  • blow one's top,
  • blow one's mind,
  • go haywire,
  • go off the deep end,
  • lose one's composure,
  • crack up,
  • break down,
  • lose it,
  • flip one's lid,
  • come unglued,
  • lose control of oneself,
  • go bananas,
  • work oneself up,
  • go berserk,
  • fly off the handle,
  • blow one's stack,
  • lose one's temper,
  • go ape,
  • freak out,
  • go nuts,
  • lose one's mind.
  •go crazy (verb)
  • go daffy,
  • go psycho,
  • go buggy.

• Other synonyms:

  •freak out
  • lost it,
  • going off deep end,
  • breaking down,
  • going berserk,
  • blowing a gasket,
  • going ape,
  • go off deep end,
  • blowing one's top,
  • blow mind,
  • lose temper.
  •Other relevant words:
  • fret,
  • flip,
  • become incensed,
  • burst forth,
  • rave,
  • tangent,
  • hysterics,
  • become furious,
  • see red,
  • boil,
  • erupt,
  • smoulder,
  • blow a fuse,
  • rant,
  • fulminate,
  • raise the roof,
  • stew,
  • have kittens,
  • run amok,
  • flip one's wig,
  • amuck,
  • bluster,
  • flare,
  • simmer,
  • fume,
  • deuce,
  • become angry,
  • foam,
  • anger,
  • riot,
  • be beside oneself,
  • go mad,
  • rage.