it's to laugh

it's to laugh idiom
Also, it is to laugh. It is absurd, laughable, as in You think the trial will be over in a week—it's to laugh! This expression is usually put as an exclamation, as in the example. [Second half of 1900s]

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.

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