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(At) the maximum level. It's so cold that I had the heat in my car going at full blast. Please stop setting the volume at full blast.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
COMMON If something is on or happening full blast, it is on or happening as loudly or as much as possible. Adam turned the heater on full blast. The radio was playing full blast. Note: People often also say that something is on or happening at full blast. Playing Coldplay albums at full blast is hardly going to help now, is it?
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
(at) full ˈblastwith great noise, power, speed, etc: Tom had his radio on at full blast — it was deafening. ♢ The heating was on full blast all day.
Farlex Partner Idioms Dictionary © Farlex 2017
mod. as strongly as possible. He honked the horn full blast for a long time.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
At full speed, volume, or capacity: turned the radio up full blast.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.