Wiktionary
copped out
vb. (en-pastcop out)
Wikipedia
Copped out
Usage examples of "copped out".
I went bravely on a couple of the rides, the kinds with little cars that bump into each other or swoop sickeningly around a central pole, and then I copped out.
Five more had said they'd think it over, and three had copped out for one reason or another.