1.
dual-wielding; fighting with two swords
A sword-fighting style using a sword in each hand. Famously associated with the legendary swordsman Miyamoto Musashi.
2.
excelling in two roles or fields simultaneously
By extension, a person who handles two different roles, skills, or positions at the same time. Widely popularized in modern usage by baseball player Ohtani Shohei, who pitches and bats.
Usage
The figurative sense (sense 2) has become extremely common in modern Japanese, particularly since Ohtani Shohei's success as both a pitcher and a batter in Major League Baseball. Now used broadly for anyone excelling in two fields simultaneously.
Common collocations
Etymology
The term originates from 宮本武蔵's 二天一流 school of swordsmanship, which taught fighting with a long sword and a short sword simultaneously.
Related Words
Compare:
二足のわらじ (wearing two hats)