What does "stepping up" mean in this sentence: ... telephone

What does “stepping up” mean in this sentence: … telephone conversation you’re not interrupting, whereas stepping up to someone in the store… Thanks

Walking towards someone to ask them a question or ask them for some information.

Ginkgo, I’m so impressed by your numbers. 100,000 words in German! 26,000 in Spanish! It’s motivating! I’ve got work to do on my Korean.