Question

make a word that means \to explain the meaning again.\

Explanation:

To form a word meaning "to explain the meaning again", we analyze the prefixes. "re - " means "again", and "define" means "to explain the meaning of". Combining "re" (prefix for again) with "define" gives "redefine", which means to define or explain the meaning of something again. The other prefixes: "pre - " means before, and "un - " means not, so they don't fit the "again" context.

Answer:

redefine