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- (intransitive, euphemistic, Britain) To pass gas; to break wind, to fart.
- (transitive) To vent, usually, to reduce pressure in a container.
- The radioactivity was released when they blew off steam from the containment vessel.
- (intransitive) To let steam escape through a passage provided for the purpose.
- The engine or steamer is blowing off.
- 1961 March, "Balmore", “Driving and firing modern French steam locomotives”, in Trains Illustrated, page 146:
- The 1 in 200 climb to Survilliers was surmounted with easy competence, the constant speed being just short of 60 m.p.h., the water level (by design) just under half a glass and the steam pressure approximately 275 lb/sq in, or near the blowing-off point.
- (idiomatic) to shirk or disregard (a duty or person).
- I decided to blow off the meeting and leave early.
- We've both been blowing off Peter all day: he's really boring.
- (transitive) To forcibly disconnect something by use of a firearm or explosive device.
- Her leg was blown off by a landmine.