Psych  v. Colloq. 1 (usu. Foll. By up; often refl.) Prepare (oneself or another) mentally for an ordeal etc. 2 (often foll. By out) intimidate or frighten (a person), esp. For one's own advantage. 3 (usu. Foll. By out) analyse (a person's motivation etc.) For one's own advantage (can't psych him out). [abbreviation]