To say things to each other; to exchange comments, jokes, or remarks (mutual speech).
昼休みに同僚と近況を言い合った。
At lunch break I exchanged updates with my coworkers.
会議で意見を率直に言い合う雰囲気ができた。
A mood developed in the meeting where people spoke frankly to one another.
友達とジョークを言い合って笑った。
I laughed exchanging jokes with my friend.
To quarrel or dispute (verbally); to argue with one another.
昨夜、隣の部屋から夫婦が激しく言い合っている声が聞こえた。
Last night I heard the couple in the next room arguing loudly.
彼らは細かいことで言い合いになり、関係がぎくしゃくしてしまった。
They ended up arguing over small things, and their relationship became strained.
駅で偶然会った昔の同僚と、考え方の違いで言い合った。
I ran into an old colleague at the station and argued with them over differences in opinion.