- an expert in three different fields or in three different skills in the same field.
- Football. a back who is proficient at running, passing, and punting: The triple threat is a rare find for coaches.
Origin of triple threat
A person who is adept in three areas, as in She's a triple threat on the editorial staff—she can edit, write, and design pages. This term comes from football, where it signifies a player who is good at running, passing, and kicking. [c. 1920] Also see hat trick.