A subentry is a smaller part of a bigger entry, like a word in a dictionary or a section in a book.
Subentries are like little brothers or sisters to the main entry. They are part of the same family, but not as important.
Examples:
The subentry in the dictionary is about a small animal.
I found the subentry about birds in the book.
The book has a subentry about cars.
The big entry is important, but the subentry is just a little guy.
In the library, there are many books with subentries about different things.
The subentry is like a baby entry, not as big but still important.