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English definition of “panic”

panic

noun [C usually singular, U] uk   /ˈpæn.ɪk/ us  
B2 a sudden strong feeling of fear that prevents reasonable thought and action: a state of panic Panic spread through the crowd as the bullets started to fly. Carmel was in a panic about her exam. He got in(to) a panic that he would forget his lines on stage.

panic

verb [I or T] uk   /ˈpæn.ɪk/ (present participle panicking, past tense and past participle panicked) us  
B2 to suddenly feel so worried or frightened that you cannot think or behave calmly or reasonably: Don't panic! Everything will be okay. The sound of gunfire panicked the crowd. The boss always panics over/about the budget every month.
(Definition of panic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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