an expert in three different fields or in three different skills in the same field.
2.
Football. a back who is proficient at running, passing, and punting:
The triple threat is a rare find for coaches.
Origin
1920-25
Examples from the web for triple threat
Tourism, transportation and technology made its economy a triple threat.
The triple threat of government debt, poor economic growth and banking instability.
Heath is a triple threat: a great saxophonist, a dynamic composer, and an innovative arranger.
Knowledge, attention to detail and a healthy sense of skepticism are a triple threat to fight investment fraud.
He's a triple threat: a star who can sing, dance and wield a weapon.
Idioms and Phrases with triple threat
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 ]