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 full blast


/ (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 full blast (1 of 2)

full blast

Also, at full blast. At full power, with great energy; also, as loud as possible. For example, The committee is working full blast on the plans, or The fanfare featured the trumpets at full blast. This expression transfers the strong currents of air used in furnaces to anything being done at full power. [Late 1700s]

Idioms and Phrases with full blast (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.