freak verb definition in Fear topic from the Oxford Advanced Learner's Dictionary

freak

 verb: Fear topic
[intransitive, transitive] (informal) if somebody freaks or if something freaks them, they react very strongly to something that makes them suddenly feel shocked, surprised, frightened, etc. freak (out) My parents really freaked when they saw my hair. freak somebody (out) Snakes really freak me out.