(enhance by contrast; "In this picture, the figures are foiled against the background")
(hinder or prevent (the efforts, plans, or desires) of; "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent")
(cover or back with foil; "foil mirrors")
(disappointingly unsuccessful; "disappointed expectations and thwarted ambitions"; "their foiled attempt to capture Calais"; "many frustrated poets end as pipe-smoking teachers"; "his best efforts were thwarted")