Maintain is a verb with multiple meanings:
1. To keep (something) in good condition by checking or repairing it regularly
2. To continue to have; to keep in existence, or not allow to become less
3. To keep stating that something is true, even though other people do not agree or do not believe it
4. To provide someone with the things they need, such as money or food
5. (Law) To assert or declare something to be true