There is the word, "Boost", and there is the word, "Blastoff", or "Takeoff", but no word to boost off, since that really doesn't mean anything.
The word "boost" has four phonemes: /b/ /oo/ /s/ /t/.
If you're talking about the word boost that is about speed, its opposite is slow down. But if you're talking about the literal or real meaning of boost (which means increase), the opposite word of that is reduce, decrease or lessen.
Hating me doesn't make you pretty. It only boost your insecurities.
your mum gave me a boost last night.... :P
brag
boost, gains
Perhaps slow or lower?
"Boost" can be either a verb or a noun: Henry hoped that meeting with the study group would boost his chemistry grade. The enthusiastic response from the audience was a real boost to her ego.
I don't think so. I don't know how to boost your level, anyways.
improve, better, increase, lift, boost, reinforce
You can boost a cars horsepower and speed by attaching a nos system to the engine. A energy drink will give you a boost to help you though the day.
boost support