freak out

verb

1. informal,  to be or cause to be in a heightened emotional state, such as that of fear, anger, or excitement

Idioms and Phrases

Experience or cause to experience hallucinations, paranoia, or other frightening feelings as a result of taking a mind-altering drug. For example, They were freaking out on LSD or some other drug . [ Slang ; mid-1960s]

Behave or cause to behave irrationally and uncontrollably, with enthusiasm, excitement, fear, or madness. For example, The band's wild playing made the audience freak out , or It was such a close accident, it really freaked me out , or She freaked out and ended up in the psychiatric ward . [ Slang ; 1960s] Also see flip one's lid ; wig out .

Related Words

• go crazy www.thesaurus.com
• lose it