designed to be carried in the pocket of the vest, in a purse, or in a similarly small space; miniature: a vest-pocket dictionary.
very small: a vest-pocket version of Versailles.
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How to use vest-pocket in a sentence
Dan nodded, folded it and tucked it away in his vest pocket.
He took one up, eased a stray safety match from his vest pocket, flicked it with his fingernail, and lit up.
The little memorandum illustrated herewith is very handy to carry in the coat or vest pocket for taking notes, etc.The Boy Mechanic, Book 2 | Various
Bristow stooped down, picked up something from the floor near the sofa and dropped it into his vest pocket.The Winning Clue | James Hay, Jr.
Now it seems Bell and Company are going direct to the public by means of vest-pocket samples and letters.
He's sure he stuck it in his vest pocket when he blew in, but it ain't there.From Place to Place | Irvin S. Cobb
British Dictionary definitions for vest-pocket
(modifier) mainly US small enough to fit into a waistcoat pocket
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012