maintain (EN)
verb

verb “maintain”

maintain; he maintains; past maintained, part. maintained; ger. maintaining
  1. to keep something in its current state or condition
    To stay healthy, she maintains a balanced diet and exercises regularly.
  2. to strongly declare something to be true
    He maintains that eating breakfast is crucial for having enough energy throughout the day.
  3. to keep something in good condition and working properly
    She regularly maintains her bicycle to ensure it's always ready for a ride.
  4. to provide financial support for someone or something over time
    The company maintained its old factory for years, despite the high costs, because it was a crucial part of the town's economy.