Weather stews


From the movie "Plane" (2023)

A plane is getting ready for departure. The main pilot is worried because of bad weather that they're pushing through.
-It's converging here over the South China Sea.
- We're aware of it. By the time you get there it should have moved inland.
-What if it sits there and stews?

What does "to stew" mean here?

Thank you!
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