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pocket (adj.)[pocket 词源字典]: 1610s, "of or pertaining to or meant for a pocket," from pocket (n.). Pocket-knife is first recorded 1727; pocket-money is attested from 1630s. Often merely implying a small-sized version of something (for example of of warships, from 1930; also compare Pocket Venus "beautiful, small woman," attested from 1808). Pocket veto attested from 1842, American English.
The "pocket veto" can operate only in the case of bills sent to the President within ten days of Congressional adjournment. If he retain such a bill (figuratively, in his pocket) neither giving it his sanction by signing it, nor withholding his sanction in returning it to Congress, the bill is defeated. The President is not bound to give reasons for defeating a bill by a pocket veto which he has not had at least ten days to consider. In a regular veto he is bound to give such reasons. [James Albert Woodburn, "The American Republic and its Government," Putnam's, 1903]
[pocket etymology, pocket origin, 英语词源]
withhold (v.): c. 1200, from with- "back, away" (see with) + holden "to hold" (see hold (v.)); probably a loan-translation of Latin retinere "to withhold." Related: Withheld; withholding. Past participle form withholden was still used 19c.