(transitive, idiomatic) To increase, augment, or advance, especially by one or more steps.

(intransitive, idiomatic) To assume or take responsibility.

That increases in stages. / (of a transformer etc) That increases a voltage.

(exercise) A workout movement wherein one leg stands on an elevated surface and lifts in the concentric part the rest of the body up onto it to target – depending on angle and starting distance of the other leg and weights applied by the arms – the femoral and gluteal muscles variously.

That has increased; heightened

Third-person singular simple present indicative form of step up

simple past tense and past participle of step up

present participle of step up

(chiefly US, idiomatic) To initiate action; to assume or take a responsibility.

(idiomatic, colloquial) To improve one's performance, or the quality of one's work.