also: りょうとうつかい
Miyamoto Musashi was a famous two-sword fencer.
being skilled in two fields; expert in two fields
Metaphorical extension from sword fighting: a person who excels in two different areas, e.g., sports and academics, or two professions.
He is both a doctor and a lawyer—truly a person skilled in two fields.
liking both alcohol and sweets; person who likes both alcohol and sweets
Colloquial, often humorous: someone who enjoys both drinking and eating sweets, rather than preferring one over the other.
She's a person who loves both alcohol and cake.
Slang, colloquial. Refers to a person who is attracted to both men and women. May be considered informal or jocular.
Rumor has it he's bisexual.