FOILING

To cover or wrap with foil.

To prevent (something) from being accomplished.

"I was foiled by my superior"

To prevent (someone) from accomplishing something.

"They foiled my plans."

To blunt; to dull; to spoil.

"to foil the scent in hunting"

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

To defile; to soil.

The act by which something is foiled; prevention of success.

"the foilings of our expectations"

The track of game, such as deer, in the grass.

A foil.