急きゅう降こう下か

noun, noun or participle which takes 'suru', intransitive verb

sudden drop; sharp fall; nosedive; swoop

Describes a rapid, steep descent of an aircraft, bird, or figuratively of prices, rankings, etc. Often used as a noun or with する.

• 旅りょ客かく機きが乱らん気き流りゅうで急きゅう降こう下かした。

  The passenger plane made a sudden drop due to turbulence.

• 株かぶ価かが急きゅう降こう下かして投とう資し家かは慌あわてた。

  Stock prices nosedived and investors panicked.