n. excess or markedly elevated pressure, especially a transient high pressure due to a shock wave
v. To subject to a high pressure
the GNU version of the Collaborative International Dictionary of English
n. Excessive pressure or urging.
The Century Dictionary and Cyclopedia
n. Excessive pressure.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a transient air pressure greater than the surrounding atmospheric pressure
Word Usage
"In addition to heavy air filters, the M-1A1s are equipped with "overpressure" -- positive air pressure inside the tanks that would keep contaminated air out in the event they are holed during a CW bombardment."