/ˈpɑkɪt ˈvitoʊ/ – Noun
Definition: việc Tổng thống không chính thức từ chối một dự luật bằng cách không ký vào trong một khoảng thời gian nhất định.
A more thorough explanation: a type of veto (=the rejection of a proposed law by one person or institution) where the President, state governor, or other person required to sign a bill does not sign the bill until it is too late for it to be dealt with by the legislative authority (eg the US Congress)
Example: As US President, he wielded the power of direct veto on 29 occasions and had 15 pocket vetoes.