foil /fɔil/ I. n. 1.［u］箔，金属薄片: tin foil 锡箔；aluminium foil 铝箔 2.［c］陪衬物，陪衬者: serve as a foil 作陪衬 ‖II. vt.挫败，使受挫折：foil sb.’s scheme 使某人的阴谋不能得逞；be foiled in one’s attempt 某人的企图成为泡影