go against the grain
Something go against the grain when you find it difficult to accept, or do, it because it opposes a belief or principle that you hold.
违背本人的意愿。
A lie went against the grain, but it was necessary.
撒谎违背我的意愿,但又是必要的。
On a piece of wood,the grain is the natural patterns and lines on its surface. It is easier to cut with the grain than against it.
grain指的是木头表面上天然的纹理。顺着纹理劈木头比较省力。