Webster's Revised Unabridged Dictionary · 1913

Foil

Foil (foil) , transitive verb

[French fouler to tread or trample under one's feet, to press, oppress. See Full, transitive verb]

1.
To tread under foot; to trample.
King Richard... caused the ensigns of Leopold to be pulled down and foiled under foot. — Knoless
Whom he did all to pieces breake and foyle, In filthy durt, and left so in the loathely soyle. — Spenser
2.
To render (an effort or attempt) vain or nugatory; to baffle; to outwit; to balk; to frustrate; to defeat.
And by {not transcribed} mortal man at length am foiled. — Dryden
Her long locks that foil the painter's power. — Byron
3.
To blunt; to dull; to spoil; as, to foil the scent in chase. — Addison

Foil , transitive verb

[See 6th File.]

To defile; to soil. [Obsolete]

Foil , noun

1.
Failure of success when on the point of attainment; defeat; frustration; miscarriage. — Milton
Nor e'er was fate so near a foil. — Dryden
2.
A blunt weapon used in fencing, resembling a smallsword in the main, but usually lighter and having a button at the point.
Blunt as the fencer's foils, which hit, but hurt not. — Shakespeare
Isocrates contended with a foil against Demosthenes with a word. — Mitford
3.
The track or trail of an animal.
Collocations (1)
To run a foil , to lead astray; to puzzle; -- alluding to the habits of some animals of running back over the same track to mislead their pursuers. — Brewer

Foil , noun

[Old English foil leaf, Old French foil, fuil, fueil, foille, fueille, French feuille, from Latin folium, pl. folia; akin to Greek {not transcribed}, and perh. to English blade. Compare Foliage, Folio.]

1.
A leaf or very thin sheet of metal; as, brass foil; tin foil; gold foil.
2.
(Jewelry) A thin leaf of sheet copper silvered and burnished, and afterwards coated with transparent colors mixed with isinglass; -- employed by jewelers to give color or brilliancy to pastes and inferior stones. — Ure
3.
Anything that serves by contrast of color or quality to adorn or set off another thing to advantage.
As she a black silk cap on him began To set, for foil of his milk-white to serve. — Sir P. Sidney
Hector has a foil to set him off. — Broome
4.
A thin coat of tin, with quicksilver, laid on the back of a looking-glass, to cause reflection.
5.
(Architecture) The space between the cusps in Gothic architecture; a rounded or leaflike ornament, in windows, niches, etc. A group of foils is called trefoil, quatrefoil, quinquefoil, etc., according to the number of arcs of which it is composed.
Collocations (1)
Foil stone , an imitation of a jewel or precious stone.