backtrick
/ˈbækˌtrɪk/Definitions
1. verb
to cheat or deceive someone, especially in a game or contest, by using unfair or underhand means.
“He was accused of backtricking his opponents to win the championship.”
2. noun
a trick or artifice used to deceive or cheat someone.
“His backtrick in the business deal cost him a lot of money.”