case up verb3 •To place (something) in cases (a box that contains or can contain a number of identical items of manufacture); to be covered in a case (a box, sheath, or covering generally); to enclose or seal as if by a case.We have to case up those bottles.The computer should be cased up when you're done using it. •(slang) Synonym of catch a case (to commit a crime and be arrested for it)I can't believe you got cased up for what happened at the store. •(slang) Synonym of case (to survey (a building or other location) surreptitiously, as in preparation for a robbery)He cased up the nicest houses in the neighborhood. formscased up · casing up · cases up