目(め)が合(あ)う

めがあう
expression
to make eye contact; eyes meet
communication
1. to make eye contact; for eyes to meet
For two people to look at each other at the same time, resulting in mutual eye contact. Often implies a brief, sometimes significant moment.
彼女(かのじょ)と目(め)が合(あ)った。
Our eyes met.
I accidentally made eye contact with a stranger on the train, and it was awkward.
When I made eye contact with the dog, it wagged its tail and ran over to me.

An intransitive expression — the subject does not actively choose to make eye contact; rather, it happens mutually. The particle と marks the other person: ~と目(め)が合(あ)う. Often used in romantic contexts to describe a meaningful first glance, or in everyday situations to describe accidental eye contact. Related expressions include 目(め)を合(あ)わせる (to deliberately look someone in the eye) and 目(め)をそらす (to look away).