at full blast, at maximum capacity; at or with full volume or speed: The factory is going at full blast.Also full blast.

Origin of blast

before 1000; 1955–60 for def 7a; Middle English (noun and v.); Old English blǣst (noun) a blowing; akin to Old Norse blāstr, Old High German blāst (derivative of blāsan, cognate with Gothic ufblēsan, Old Norse blāsa). See blow2


1 squall, gale, blow, storm. See wind1.
2 blare, screech.
11 discharge, outburst.
16 annihilate.

Related forms

blast·er, nounblast·y, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for blast off


/ (blɑːst) /



slang an exclamation of annoyance (esp in phrases such as blast it! and blast him!)


See also blastoff

Derived Forms

blaster, noun

Word Origin for blast

Old English blǣst, related to Old Norse blāstr
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with blast off (1 of 2)

blast off


Also, blast away. Take off or be launched, especially into space, as in They're scheduled to blast off on Tuesday. This usage originated with the development of powerful rockets, spacecraft, and astronauts, to all of which it was applied. [c. 1950]


Depart, clear out, as in This party's over; let's blast off now. [Slang; early 1950s]


Become excited or high, especially from using drugs, as in They give parties where people blast off. [Slang; c. 1960]

Idioms and Phrases with blast off (2 of 2)


In addition to the idiom beginning with blast

  • blast off

also see:

  • full blast
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.