Deccelerate 

Accelerate was the lead single from Floptina's comeback album, liberation, that failed to, well, accelerate to the top 10.

Deccelerate down the charts

Deccelerate by hyrule_galaxy June 3, 2019

deceleration trauma 

A term describing damage caused by slamming or smashing something.

"My cell phone dropped out of the window and died of deceleration trauma"

deceleration trauma by DanoNYC January 17, 2010

Deceleration 

The process of taking all the disgusting celery out of your soup.

Eww, dude wtf?! Don't eat your soup without deceleration FFS!

Deceleration by Retto Elbaroda February 18, 2021

Deceleration 

The process of coming down from speed

Aw shit, man. I'm starting to get some deceleration.

Deceleration by Brovahkiin93 June 2, 2016

vegan deceleration day 

it's a holiday made up by that vegan teacher as a result to her sanity going to the uncanny valley

that vegan teacher: it's vegan deceleration day!

person: ok and?

vegan deceleration day by dagr8estgamer February 26, 2022

Decelerating

The act of slowing or bringing speed down.

He was decelerating the car.

Decelerating by Oregano is great on pizza January 26, 2019

rapid deceleration syndrome 

(abbreviated to RDS)

Term for the effects of travelling at great speed and then hitting an immovable object... such as cuts, bruises, broken limbs, paralysis or death.

Originally military slang, but now used by other groups, for example:
Rock climbers: The effects of falling from a great height.
Cyclists: The effects of misjudging a corner and hitting a wall straight on.

Severe Rapid Deceleration Syndrome or SRDS usually refers to death.

"Is Mike out climbing today?"
"No he took a whipper yesterday, and he's at home recovering from a case of rapid deceleration syndrome"

"I need the day off work to go to a friends funeral - he caught a fatal case of RDS while out biking the other day"

rapid deceleration syndrome by Jimmy1 January 22, 2007