descend to somebody's level
sink to somebody's level
stoop to somebody's level

"We musn't stoop to their level," Bob said, trying hard to project a reasonable quality to his voice.

"They feel they accomplished something but I can't stoop to their level to try to understand it," he said.

Whatever happens, we must not stoop to their level.

In becoming human, Jesus stooped to our level of need.

Do we really want to stoop to his level.

To fight back would not only be stooping to the child's level, but it would also run the risk of seriously damaging her.

But she would not stoop to their level.

We of the Dessin-ka will not stoop to their level.

Lara drew herself up, angry for having stooped to his level.

The band stated that they didn't want to "stoop to his level" and chose to simply ignore the controversy.