step on

Verb

 * 1)  To adulterate (a drug) for the purpose of increasing its bulk, and therefore the profit when sold; to dilute, cut.
 * 2)  To oppress or mistreat (a person).
 * 3)  To interrupt, overpower, or override (another transmission on the same frequency) with one's own transmission.
 * 4)  To approach as to confront or fight.
 * He stepped on to the vicious man.
 * He stepped on a rock.
 * 1)  To interrupt, overpower, or override (another transmission on the same frequency) with one's own transmission.
 * 2)  To approach as to confront or fight.
 * He stepped on to the vicious man.
 * He stepped on a rock.
 * He stepped on a rock.