IDIOM ►

ride roughshod over someone or something

Meaning 1
to ride a horse with rough shoes on its hooves over something
Sentence 1
The cowboys rode roughshod over the trail in order to get the cattle to market on time.
Meaning 2
to treat someone poorly
Sentence 2
Please don't ride roughshod on the new employee. Be nice.

Derivation

When cowboys took cattle a long distance to market the shoes on their horses became rough and would tear up the trail.