1. It might be a misspelling: It's possible that "amaru" is a misspelling of another Hausa word. For example, it could be a misspelling of "amarya", which means bride.
2. It might be a name: "Amaru" could be a name, although it is not a very common one.
3. It might be a borrowed word: It is possible that "amaru" is a word borrowed from another language and incorporated into Hausa.
Without further context, it is difficult to determine the exact meaning of "amaru" in Hausa.
To get a better understanding, please provide more context or the sentence in which you encountered this word.