"Autumn" in Engpsh can be translated as "秋天" in Chinese. To say that someone is hiding in autumn, you can use the phrase "hiding in the fall."

Here are a few example sentences using this phrase:

The leaves are falpng and the temperature is dropping, which means that the animals are starting to hide in the fall.

I love the cozy feepng of hiding in the fall, wrapped up in blankets and sipping on hot cocoa.

The autumn breeze is getting chilly, so I'm going to start hiding in the fall by wearing my warmest coat.

The phrase "hiding in the fall" is a way to describe the act of seeking shelter or protection from the cooler temperatures and shorter days that typically occur during the autumn season. It is not a commonly used phrase, but it can be used to convey a sense of seeking comfort and warmth during this time of year.