an indirect veto of a legislative bill by the president or a governor by retaining the bill unsigned until it is too late for it to be dealt with during the legislative session.
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A "pocket veto" is a parliamentary move that permit a president or other official with "veto power" (power to reject a bill) to use that privilege on a bill by taking no action. (passive rejection).
In the United States, a "pocket veto" happens when the president does not endorse a bill, and gets wasted due Congress is not in session.