Longman Dictionary of Contemporary English
Wiktionary
alt. 1 (context idiomatic English) avoidance or inadequate performance of a task or duty; the action of cop out. 2 (context idiomatic English) An excuse made in order to avoid performing a task or duty; a reason offered when someone cops out. 3 (context idiomatic English) A person who cops out. n. 1 (context idiomatic English) avoidance or inadequate performance of a task or duty; the action of cop out. 2 (context idiomatic English) An excuse made in order to avoid performing a task or duty; a reason offered when someone cops out. 3 (context idiomatic English) A person who cops out.
Wikipedia
Usage examples of "cop-out".
In fact, values can be used in harmful ways: a source of guilt, a cop-out that appeases your conscience ("I'm not doing much but I have wonderful values"), a device for putting down others ("my values are better than yours"), etc.
Bit of a cop-out ending though, having the hero fall through the roof of a circus tent and then just wake up in his own bed.