English Dictionary

Secret; clandestine; hence, mean; unfair; fraudulent.
Source : opted (165317)  - auto

Done, as pitching, with the hand lower than the shoulder, or, as bowling, with the hand lower than elbow.
Source : opted (165318)  - auto

By secret means; in a clandestine manner; hence, by fraud; unfairly.
Source : opted (165319)  - auto

In an underhand manner; -- said of pitching or bowling.
Source : opted (165320)  - auto