1 [U] (also tinfoil) metal that has been made into very thin sheets, used for putting around food 箔: aluminium foil铝箔
2 [C] a long, thin, pointed weapon used in a type of fighting sport (fencing) 花剑,钝头剑(用于击剑运动的)
foil²
/fɔɪl ||; fɔɪl/verb [T] to prevent sb from succeeding, especially with a plan; to prevent a plan from succeeding 阻挠,阻碍(尤指计划): The prisoners were foiled in their attempt to escape.那些囚犯设法越狱,但未能得逞。