急きゅう加か速そく

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

sudden acceleration; rapid acceleration

Used for vehicles, machines, or figurative situations where speed increases sharply. Often implies an abrupt or unexpected change.

• 車くるまが急きゅう加か速そくして、あっという間まに見みえなくなった。

  The car suddenly accelerated and disappeared in no time.

• 景けい気き回かい復ふくの動うごきが急きゅう加か速そくした。

  The economic recovery suddenly picked up speed.