full blast

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full blast (uncountable)

1. (idiomatic) Maximum capacity or effort
   • 1944 January and February, “Light Railways in Derbyshire”, in Railway Magazine, page 25:

     At Fallgate a short branch leading to a quarry is disused, but some gravel pits are working at full blast; [...].

• full throttle
• full tilt

• John Camden Hotten (1873) The Slang Dictionary