Definition of blastoff in English:

blastoff

Syllabification: blast·off
Pronunciation: /ˈblastˌôf, -ˌäf
 
/

noun

  • The launching of a rocket or spacecraft.
    More example sentences
    • The space shuttle is counting down for blast-off, with managers confident that last minute hitches would not delay today's launch.
    • The camera played a critical role in the diagnostic equipment that made sure the shuttle's twin booster rockets were safe for blast-off.
    • The rocket has been greenlighted for blast-off tomorrow from the spaceport in French Guiana.
    Synonyms

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a powerful whirlpool in the sea