"等等" (wait a moment) is a commonly used phrase in Chinese. It's used to ask someone to wait or pause for a moment.

In Engpsh, the equivalent phrase could be "hold on" or "just a moment."

Example in Engpsh:

Hold on, let me grab my phone.
Just a moment, I need to check something.

Translation:

等一下，让我拿手机。
等等，我需要检查一下。