slang To observe and examine someone or something, often to gain knowledge for a specific future purpose. A noun or pronoun can be used between "case" and "out." I cased my opponent out in preparation for the big fight. Judging from the security footage, those men cased out the shop hours before robbing it.
case someone or something out
Sl. to look someone or something over carefully, with a view to additional activity at a later time. He came into the room and cased all the lighting fixtures out. He cased out the fixtures to see which ones to replace. John cased the girls out.