There are 2 definitions of kick down in English:

kick down1

British Change quickly into a lower gear in a car with an automatic transmission by a sudden full depression of the accelerator.
More example sentences
  • However, the transmission has a tendency to kick down into first gear all too easily, which can make progress around town a little jerky.
  • I kept thinking the bike was going to stall as the revs dropped, and rather than kicking down a few gears, rolling off the throttle, and using a bit of brake to go around a corner, I had to use the brakes alone to slow me down.
  • You get the odd hairy moment when coming over a ridge and round a corner at the same time as the car kicks down a gear and opens the throttle to maintain its speed.
See parent entry: kick

Definition of kick down in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up

There are 2 definitions of kick down in English:

kick-down2

Line breaks: kick-down

noun

British
A device for changing gear in a motor vehicle with automatic transmission by full depression of the accelerator.
More example sentences
  • But I could also do the same in the auto mode, and quicker, with the accelerator kick-down.
  • Upchanging was quite seamless, and even with full throttle kick-downs there were no nasty thumps to upset grandma in the back.
  • The auto box is great around town although the delay in reacting to kick-downs might make your passengers think you're a bit of a lead-foot.