noun, adverb
both (people); the two of them
Refers to two people together, often used adverbially to mean 'both' or 'the two of them' in a sentence.
二人とも元気ですか。
Are both of you doing well?
二人とも同じ意見だった。
Both of them had the same opinion.
Compound of 二人 (ふたり, 'two people') and とも ('both, all').