名詞 step-up:

1. the act of increasing something
   同義詞：increase

動詞 step-up:

1. increase in extent or intensity
   同義詞：escalate, intensify, step up
2. speed up
   同義詞：rev up, step up
3. make oneself visible; take action
   同義詞：come to the fore, step forward, come forward, step up, step to the fore, come out