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level-off

[lev-uh l-awf, -of]
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noun Aeronautics.
  1. the maneuver of bringing an aircraft into a horizontal flying position after an ascent or descent.
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Origin of level-off

First recorded in 1925–30; noun use of verb phrase level off
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018