The word "blast offs" refers to the act of launching a rocket or spacecraft. As such, some antonyms for this term may include "landing," "touchdown," "arrival," "docking," or "berthing." These words all refer to the opposite action of taking off and suggest a more controlled, gradual descent or arrival. Other antonyms may include words like "descent," "falling," "crash landing," or "abort." These words indicate a negative or unsuccessful outcome, rather than a successful launch. Ultimately, the antonyms for "blast offs" depend on the context in which the term is being used and the outcome that is being referenced.