Definition of あう
- (v5u, vi) to come together; to merge; to unite; to meet
- to fit; to match; to suit; to agree with; to be correct
この白いコートはあなたによく合うでしょう。
This white coat will look very nice on you. - to be profitable; to be equitable
- (suf, v5u) (after the -masu stem of a verb) to do ... to each other; to do ... together
2人の女性はお互い微笑みあった。
The two ladies smiled at each other.