Pronunciation: (step'up"), [key]
1. effecting an increase.
2. Elect.serving to increase voltage: a step-up transformer.
3. (of a lease) allowing for gradual rent increases to the highest amount permissible.
an increase or rise in the rate or quantity of something. Also,step'up".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.