Impound \Im*pound"\, v. t. [imp. & p. p. {Impounded}; p. pr. & vb. n. {Impounding}.] To shut up or place in an inclosure called a pound; hence, to hold in the custody of some authority such as police or a court; as, to impound stray cattle; to impound an illegally parked car; to impound a document for safe keeping. [1913 Webster +PJC]
But taken and impounded as a stray, The king of Scots. --Shak.
This power to impound was used narrowly, often when circumstances changed after enactment.
Under the act, the president was allowed to temporarily impound any line item, but only until either the House or the Senate passed a resolution to override that impoundment.
In Kendall, the court determined that the executive powers of the president provided in Article II of the Constitution did not permit the president to impound a specific appropriation that would require no presidential discretion to administer.
Congress might pass a bill acknowledging that the President has the power to impound, but the line-item veto subject to an override is a less radical solution.
Ford called for Congress to reinstate the president's power to impound appropriated money, a device Congress removed when it streamlined the budget process in 1974.