upust

Upust is a masculine noun in Polish that denotes a release, concession, or discharge, depending on context. In everyday language the most common sense is a price concession or discount granted by a seller or during negotiations. The term can also refer to a leniency or relief granted by an authority in more formal or administrative contexts, though more specialized words such as ulga or zezwolenie are often used in those domains.

In technical and engineering usage, upust can mean an outlet, vent, or discharge point that allows the release of fluids or gases or the equalization of pressure. This sense appears in discussions of systems and infrastructure where controlled release or drainage is required, and it is generally distinguished from related terms such as wylot or ujście, which describe other kinds of outlets depending on the context.

The word likely derives from the Polish verb puszczać (to let go or release) with the prefix u-, forming a noun that describes an act or point of release. Over time the sense related to concessions and discounts became common in commerce, while the technical sense persists in engineering and construction literature.

See also: ulga, zniżka, rabat, wylot, ujście. Notes and usage guidance can be found in standard Polish dictionaries and corpora, which document the varying senses and domain-specific applications of upust.