simple past tense and past participle of foil

(architecture) Having a foil.

simple past tense and past participle of FOIL

(transitive) To apply the FOIL algorithm to.

(mnemonic) An acronym for the algorithm for multiplying two binomials.

To prevent (something) from being accomplished. / To prevent (someone) from accomplishing something. / To blunt; to dull; to spoil. / (obsolete) To tread underfoot; to trample.

(obsolete) To defile; to soil.

A very thin sheet of metal. / (uncountable) Thin aluminium/aluminum (or, formerly, tin) used for wrapping food. / A thin layer of metal put between a jewel and its setting to make it seem more brilliant.

(mathematics) To expand a product of two or more algebraic expressions, typically binomials.

(hunting) The track of an animal.