foils is a form of:

Foil



noun
1.
(metal rolled into a paper like sheet, something that sets off another thing by contrast. slender sword with a blunt point, used in fencing) សន្ធឹកស្ដើងៗ, បន្ទះស្ដើងៗ, mirror foil លោហធាតុដាក់នៅក្រោយកញ្ចក់អោយចាំងពន្លឺឬឆ្លុះស្រមោល, perfect foil អ្វីៗដែលធ្វើអោយអ្វីមួយផ្សេងលេចឡើង
verbpast tense: foiled ; past participle: foiled ; present participle: foiling ;
1.
(TRANSITIVE) (To frustrate, to baffle) ធ្វើអោយខកខាន, សម្រេច
ENGLISH MEANING
noun
1.
Failure of success when on the point of attainment; defeat; frustration; miscarriage.
2.
A blunt weapon used in fencing, resembling a smallsword in the main, but usually lighter and having a button at the point.
3.
The track or trail of an animal.
4.
A leaf or very thin sheet of metal; as, brass foil; tin foil; gold foil.
5.
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.
6.
Anything that serves by contrast of color or quality to adorn or set off another thing to advantage.
7.
A thin coat of tin, with quicksilver, laid on the back of a looking-glass, to cause reflection.
8.
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.
verbpast tense: foiled ; past participle: foiled ; present participle: foiling ;
1.
(TRANSITIVE) To tread under foot; to trample.
2.
(TRANSITIVE) To render (an effort or attempt) vain or nugatory; to baffle; to outwit; to balk; to frustrate; to defeat.
3.
(TRANSITIVE) To blunt; to dull; to spoil; as, to foil the scent in chase.
1.
To defile, to soil