To wrap in foil or to envelop in a thin metallic covering; to defeat or frustrate someone's plans.
From 'en-' (to wrap) plus 'foil,' which can mean either the thin metal sheet or the verb meaning to thwart. The wrapping sense comes from the material, the thwarting sense from 'foil' as to frustrate.
This word is fascinating because 'foil' has two totally different meanings—the shiny metal and the act of defeating someone—both can follow 'en-' but mean completely different things.
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