There are 2 main definitions of blast off in English:

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blast off1

(Of a rocket or spacecraft) take off from a launching site: space shuttles generally blast off with a minimum of fuss
More example sentences
  • The spacecraft will blast off on 26 October on a journey that will take it approximately five months.
  • Current polar satellite launch vehicles can blast off carrying 1,000 to 1,200-kilogram units.
  • A privately-built rocket blasted off into suborbital space above California's Mojave Desert today.
Synonyms
be launched, take off, lift off, leave the ground, become airborne, take to the air
See parent entry: blast

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There are 2 main definitions of blast off in English:

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blast-off2

Line breaks: blast-off

noun

[mass noun]
The launching of a rocket or spacecraft: [as modifier]: a blast-off thrust of 78,000 lb figurative the policy was now in place for blast-off
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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