。
Our eyes met.
Literal
Eye [and-と] eye [subject-が] met.
A fixed way of saying 'our eyes met' that uses conjunctive と to link 目 to itself — 'eye and eye' — rather than using a possessive or pronoun. The が then marks the combined '目と目' as the grammatical subject of 合う ('to meet, to match'). Whose eyes they belong to is entirely inferred from context; Japanese doesn't need to say 'my eyes met his/hers.' 目が合う is the common set phrase for accidental eye contact.