Meaning: In ancient times, it was the same as "heaven". It has nothing to do with the kind of aquatic animals that are often used to swear. It's not as complicated as you think. This word is an archaic form of "Tian", which is also pronounced as "Tian". The person who coined this word must have suffered a lot and couldn't get revenge, so learn from Ah Q to comfort himself and hurt the "God" behind him like a son of a bitch. )