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case up

(transitive) 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 o

ˈkeɪs ˈʌp148 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 26, 2026US

(transitive) 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.
Cluster: drugs
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US
#2·Apr 26, 2026US

(transitive, slang) (to survey (a building or other location) surreptitiously, as in preparation for a robbery).

The buildings around it case it up.
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US
#3·Apr 26, 2026US

(transitive, slang, AAVE) (to commit a crime and be arrested for it).

The computer should be cased up when you're done using it.
For parents

Case up means: (to commit a crime and be arrested for it).. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.

For ESL learners

case up means: (to commit a crime and be arrested for it).. Register: very informal, slang. Suitable only for casual conversation, chat and social media. Do not use in business, academic or news writing. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.

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