Acceleration can be both up and down, even if they have a seperate word for the negative form of it. I was told in Physics not to use the word 'deceleration' as it's not scientificallycorrect.
It's like everyone tells a story about themselves inside their own head. Always. All the time. That story makes you what you are. We build ourselves out of that story. — Patrick Rothfuss, The Name of the Wind
