foil 1 1. n (-s) – A device that provides reactive force when in motion relative to the surrounding air or water.
2: vb (tr) – to baffle or frustrate (a person, attempt, etc.)
3. vb (tr) – to obliterate the scent left by a hunted animal or (of a hunted animal) to run back over its own trail.
foil 2 (America’s Cup Definition) – a device that provides reactive force when in motion, used to baffle or frustrate hunters of information on AC72 lifting foils. See, e.g. Jimmy Spithill’s Facebook pic of the foils on the ‘flying’ AC45 from last week, compared to the nearly identical official Grenier photo of the same subject at the same time. Punk’d? Say so in the thread.