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good off

Shirk work or responsibility, loaf; fool around. For example, We were supposed to be studying but we were really goofing off, or If you ever feel like goofing off, please call me. This idiom was a synonym of goof up during World War II, a usage that has died out. [Slang; 1920s]

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