急降下

(1)a steep nose-down descent by an aircraft

(2)航空機による、機首を下に向けた急激な降下

(3)a sudden sharp drop or rapid decline; "the stock took a nosedive"

(4)突然の急落または急速な低下

(5)a very rapid raid

(6)非常に迅速な襲撃

(7)a swift descent through the air

(8)空中をすばやく降下すること