step-up
noun ) an increase or advance in size or amount
step up
1: to increase (a voltage) by means of a transformer
2: to increase, augment, or advance especially by one or more steps
step up production
1a: to come forward
stepped up to claim responsibility
b: to succeed in meeting a challenge (as by increased effort or improved performance)
2: to undergo an increase
business is stepping up
3: to receive a promotion