Closed pronunciation

There is only one pronunciation, and that is the second pronunciation. The dictionary is wrong.

The second sound in the dictionary means melting metal, and the fourth sound means closing the shop. In fact, in ancient times, the word "Guan" used to describe the closure of shops essentially refers to melting metal, but it only refers to the closure of shops.

In other words, the second sound and the fourth sound have the same meaning, so it is wrong to divide this word into disyllabic words.

Scientific and reasonable pronunciation should be the second sound. If read as the fourth sound, it is homophonic with "proofing", which is easy to cause ambiguity. Because there is another word called "proofing". Someone in Zhihu gave an example: for example, he went to a shoe store and ordered a pair of shoes. Then ask the store, "I'll come over tomorrow night. When will you call Yang? " Does this mean shoe proofing or closing the store?

Because I read the second sound, without this ambiguity, it is normal to read.