Slowing down, maybe? Caused by friction, if that's what you're asking.
When an object slows down it is still accelerating.
sliding friction slows down a sliding object
Air resistance.
gravity
It slows the object down.
friction
When an object slows down, its acceleration is negative (in a linear sense), or in a direction opposed to its motion (in a vector sense).
Slows it.
Slower than it was before.
When a car slows down
straight
The object slows down and eventully stops.