Hook Maneuver Definition

noun

(aviation HOOK MANEUVER technique to increase G-tolerance and reduce G-LOC incidences, which involves powerful inhalation, and rapid exhalation, resulting in breathing noises that sound like "HOO" for inhalation, and "KEH" for exhalatoin, (HOO-KEH... hook)

Wiktionary

Origin of Hook Maneuver

hook +‎ maneuver HOOK MANEUVER From the anglicized onomatopoeia of the sound produced when practising the maneuver, with the inhalation "HOO" and exhalation "KEH" sounds.

From Wiktionary