Definitions

1. noun

A person or thing that foils or hinders something, especially an opponent in a contest or a competitor in a business.

“The company’s new marketing strategy was a clever foiler of their competitors’ attempts to poach their employees.”

2. verb

To foil or hinder something, especially an opponent in a contest or a competitor in a business.

“The team’s coach foiled the opposing team’s strategy by changing their play just in time.”