vest pocket
vest·poc·ket
noun
Origin
From vest + pocket, referring to the pockets of a suit vest, which are only sized to hold watches, handkerchiefs, wallets, and similarly small items.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.