(sīk) v.t. Slang
1. To make mentally ready, as by inducing alertness or tension; key up: often with up.
2. To cause to lose self-assurance, especially in order to place at a competitive disadvantage; demoralize: often with out: to psych rivals.
3. To manipulate by the use of psychology; especially, to outwit: often with out: psyched him into giving me a loan.
4. To understand: with out: couldn't psych it out. Also psyche.

See PSYCHO-.