cop out

cop out idiom
Back out of a responsibility or commitment; also, take the easy way out. For example, Don't count on him; he's been known to fake illness and cop out, or She'll cop out and let her assistant do all the work. These meanings are derived from the underworld slang use of cop out for backing down or surrendering. [Late 1950s]

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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