Used other than figuratively or idiomatically: see step, on.
to adulterate a drug for the purpose of increasing its bulk, and therefore its profit; to dilute, cut.
To tread upon forcibly and repeatedly; to trample.
To cleanse, as clothes, by treading upon them in water.
To travel or wander through.
To hitchhike.
To walk with heavy footsteps.
To walk for a long time (usually through difficult terrain).
see Wikipedia:tramp steamer
A long walk, possibly of more than one day, in a scenic or wilderness area.
A disreputable, promiscuous woman; a slut.
Of objects, stray and intrusive and unwanted
A metal plate worn by diggers under the hollow of the foot to save the shoe.
A homeless person; a vagabond.
Any ship which does not have a fixed schedule or published ports of call.