Here's the answer:
“等一会儿”
(děng yíhuì'r)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- děng yí huì'r
- děngyíhuì'r
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 91.86% of the time!