freak out
phr. v..phr. v.. to suddenly feel very shocked, scared, or angry. You use this when someone loses their cool because of a surprise or a problem.
phr. v.. to experience or cause someone to experience a sudden, intense emotional reaction, typically involving fear, shock, or anger; functions as both an intransitive and transitive phrasal verb.
Don't freak out, but I lost your keys.
The loud noise freaked out the cat, and it hid under the sofa for hours.
Investors began to freak out as the market indices plummeted, leading to a wave of panic selling across the global exchanges.
From freak + out. Countercultural slang, originally referring to a positive reaction or experience from the use of a psychotropic, usually a hallucinogenic or psychedelic drug. First use appears c. 1966 in several newspapers, particularly in the Independent (Long Beach, California).
very common in spoken English; can be used with or without an object.
contrast with 'panic' to show that 'freak out' often implies a more visible or dramatic loss of control; it is a high-frequency item in pop culture and media.
He was freak out by the news.He was freaked out by the news.the verb must be conjugated in the past participle form when used in the passive voice.