simple past tense and past participle of walk on air

(medicine) The sensation of inadequate inspiration that typically results in an increased respiratory drive, and deep, rapid and laboured breathing.

To be ecstatic.

plural of air bearing

(construction) An ample space left at the foot of foundation walls for the sake of dryness.

plural of air drain

To fight to no purpose, or against an imaginary enemy.

plural of air sac

(of a missile) fired from a an aircraft in flight to a ship

(of a missile) fired from a ship at an aircraft in flight, or at an incoming missile