(intransitive) To act as a replacement or substitute. / (intransitive) To get involved; to act

(also in plural) An item of clothing which one steps into to put on; specifically, women's panties.

(African-American Vernacular, slang, transitive) To challenge, confront or fight (with someone). / (African-American Vernacular, slang, transitive) To meet a challenge or confront (someone).

(US) Initialism of Smart Traveler Enrollment Program.

Used other than figuratively or idiomatically: see step, on. / (recreational drugs, transitive) to adulterate a drug for the purpose of increasing its bulk, and therefore its profit; to dilute, cut.

(slang, archaic) To run away; scram.

simple past tense and past participle of step

Provided with a step or steps; having a series of offsets or parts resembling the steps of stairs.

present participle of step

The act of taking a step.