like shooting fish in a barrel
Ridiculously easy, as in Setting up a computer nowadays is like shooting fish in a barrel. This hyperbolic expression alludes to the fact that fish make an easy target inside a barrel (as opposed to swimming freely in the sea). [Early 1900s]
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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.