Electricity Serving to increase voltage: a step-up transformer. (adjective)
An increase in size, amount, or activity. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "step-up" in a sentence
"And American Range has a "step-up" feature for its 24 -, 30 - and 36-inch ranges: The back burners are elevated for easier access."
"Not surprisingly, this series doesn't include any step-up features, including either Smart TV or Smart Hub."
"(Comment: I think this solution is undercut because people forget source more easily than they forget content, causing them to step-up the credibility of anonymous allegations over time.) (6) Note the growth of cases against nonmedia defendants."