pocket veto
noun [ C usually singular ] US uk/ˌpɒk.ɪt ˈviː.təʊ/ us/ˌpɑː.kɪt ˈviː.t̬oʊ/
搁置否决（指政府对拟议的法律不予签字，搁置至年度结束，该法律提案即失效）
a way that a government can stop a law from being introduced by deliberately failing to sign it before the government finishes its business for the year