After a moment, her knee bumped gently against his.

When she turned on her side toward him her knees bumped his.

My knees bumped against Zac as he got between her thighs.

My knee bumped the wall in front of me.

"Closer," he said, and she moved until her knees bumped the side of the bed.

While we were talking, my knee bumped against them.

The table was small enough that their knees bumped.

His bad knee bumped a chair, and he let himself spill into it.

His knees bumped the edge of the bed.

His left knee bumped against the edge of a wooden crate.