What is the meaning of Step_on?

To adulterate (a drug) for the purpose of increasing its bulk, and therefore the profit when sold; to dilute, cut.

To oppress or mistreat (a person).

To interrupt, overpower, or override (another transmission on the same frequency) with one's own transmission.

To approach as to confront or fight.

Used other than figuratively or idiomatically: see step, on.

Source: wiktionary.org