step on *
tread on

Yet she felt as if her feet trod on air.

After a while he heard her quick, light tread on the rock behind him.

His head felt as though someone was treading on it.

The only reason he didn't move was for fear of treading on something worse.

We do not want to tread on people sleeping in the street.

They won't be helped by heavy feet treading on them.

The guard came in quickly, nearly treading on her feet, and said something she didn't understand.

I'm not treading on new ground, but I think a lot of people - including myself - deal with that all the time.

Even his choice of phrase was significant: Tried to tread on you, did they?

He could not avoid treading on the plants at the other side.