To say too much; to go too far in speech; to overstate or exaggerate.
昨日は感情的になって言い過ぎてしまった。ごめん。
I got emotional and said too much yesterday. I'm sorry.
正直に言うのはいいが、言い過ぎは相手を傷つける。
It's good to be honest, but going too far with words will hurt the other person.
その説明は言い過ぎだと思う。もう少し控えめに話そう。
I think that explanation is an exaggeration. Let's speak a bit more modestly.
冗談でも言い過ぎると場の雰囲気が悪くなることがある。
Even jokes can spoil the atmosphere if they go too far.