impounding

To shut up or place in an enclosure called a pound

“His car got impounded after he'd parked illegally.”

To hold back (for example water by a dam)

To hold in the custody of a court or its delegate

“to impound stray cattle; to impound a document for safe keeping.”

To collect and hold (funds) for payment of property taxes and insurance on property in which one has a security interest

An act of impoundment.