Definition of "monkey business" []

Slang Silly, mischievous, or deceitful acts or behavior. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Words like "monkey business"

devilment devilry deviltry

I'll be a monkey's uncle

mischief mischief-making mischievousness monkey

monkey around monkeyshine rascality roguery

roguishness shenanigan