"Wait a moment" or "Hold on" are two common ways to say "稍等等一下" in Engpsh.
Example in Engpsh:
"Wait a moment, I'll be right back."
"Hold on, let me grab my phone."
Their translations in Chinese:
"稍等一下，我马上回来。"
"稍等，让我拿一下手机。"
These expressions are commonly used in Engpsh-speaking countries and are a part of everyday conversation.