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“Foil” means to obscure or confuse (to leave a false trail or scent) so as to evade or spoil pursuers.

Really?

Definitions of foil on the Web:
(wordnetweb.princeton.edu/perl/webwn)

* a piece of thin and flexible sheet metal; “the photographic film was wrapped in foil”
* anything that serves by contrast to call attention to another thing’s good qualities; “pretty girls like plain friends as foils”
* enhance by contrast; “In this picture, the figures are foiled against the background”
* hydrofoil: a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through; “the fins of a fish act as hydrofoils”
* thwart: hinder or prevent (the efforts, plans, or desires) of; “What ultimately frustrated every challenger was Ruth’s amazing September surge”; “foil your opponent”
* picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
* cover or back with foil; “foil mirrors”
* a light slender flexible sword tipped by a button

IB4TZ!