step up
US /step ʌp/
UK /step ʌp/

1.
intensificar, aumentar, acelerar
to increase the amount, speed, or intensity of something
:
•
We need to step up our efforts to meet the deadline.
Precisamos intensificar nossos esforços para cumprir o prazo.
•
The company decided to step up production to meet demand.
A empresa decidiu intensificar a produção para atender à demanda.
2.
assumir, tomar a iniciativa, intervir
to take action when there is a need or problem
:
•
It's time for you to step up and take responsibility.
É hora de você assumir e tomar responsabilidade.
•
When the team was struggling, the captain really stepped up.
Quando o time estava em dificuldades, o capitão realmente assumiu a liderança.