Indicates that something is as someone says, or that one will do as said. Often used as '〜が言う通りに' or '〜の言う通りに'.
あなたが言う通り、今回は準備が不十分だった。
Just as you said, the preparation this time was insufficient.
先生の言う通りに解答を書いてください。
Please write your answers as the teacher says.
彼の言う通りにしておけばよかったと後で気づいた。
I realized later that I should have done as he said.