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freak out▼(react with anger or fear)
verb
[UK: friːk ˈaʊt] [US: ˈfriːk ˈaʊt]

lose one's cool▼(to lose one's temper)
verb
[UK: luːz wʌnz kuːl] [US: ˈluːz wʌnz ˈkuːl]

lose one's shit▼(vulgar: to lose one's temper)
verb