1. [noun] Psychology or psychiatry.
2. [noun] A psychologist; a psychiatrist.
3. [adjective] Psychedelic.
4. [verb] (transitive) (reflexive) To put (someone) into a required psychological frame of mind (also psych up).
5. [verb] (transitive) To intimidate (someone) emotionally or using psychology (also psych out).
6. [verb] (transitive) (informal) To treat (someone) using psychoanalysis.
7. [interjection] (slang) Indicating that one's preceding statement was false and that one has successfully fooled one's interlocutor. Also sike.
