He acted as a 'foil for' the comedian. [=he acted very serious to make the comedian seem funnier]
His reserved manner was a perfect 'foil for/to' her bubbly personality.
That dark blue dress is good 'foil for' her blonde hair.
(..) Right here. Oh, fuck. It worked. Oh, no. Not now. You didn't really think you could foil God's plan, did you? This was how it was always meant to be. I will wait on a pillar of light for God's return. And you'll burn in eternal hellfire. (..)2011 TvShow: Dexter Title: Talk to the Hand Season: 6 Episode 11