be a foil to (someone)(redirected from are a foil to them)
be a foil to (someone)
To contrast with someone else and thus highlight their unique qualities. Of course Edgar Linton ends up marrying Catherine—he's totally a foil to Heathcliff throughout the whole novel. With her humor and upbeat demeanor, I found my sister to be a foil to dour Seth.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.