tread something into something
tread something onto something
tread something over something

Then he trod the man's fingers into the dirt.

He trod into a mosaic plaza and saw their forms.

And in many cases, extending the sales tax to services will not exactly be treading into virgin territory.

Treading into foreign territory will pose some problems for Johnson.

The thing parted a brake and trod forth into the open.

When she stepped off the top tread into the attic, he followed her up.

Can he tread his way back into contention in the second set?

It is treading into family values territory, and running the risk of sounding like the 1992 Republican platform.

Tam had learned not to tread further into the labyrinth.