Literally "a Sichuan dog barking at the sun"; used to describe a person who is surprised or alarmed by perfectly normal things because of their own lack of experience or narrow perspective. This idiom refers to the foggy climate of Sichuan where the sun is rarely seen.

Literally meaning a mad dog barking at the sun; used to describe bad people making noisy but powerless threats, or to describe any effort that is completely useless.