Under

1. In a lower position or place than. A rug was under the table.
2. Beneath the surface of. She swam under water for 10 yards.
3. Less than; smaller than. The jar's capacity is under three quarts.
4. Subject to the restraint or obligation of. He was under contract by the movie company
5. Sowed or planted with. They had ten acres under oats.
6. Powered or propelled by. We needed to get the ship under sail.
7. Inferior to in status or rank. Nine employees are under my supervision.
8. In view of; because of. Under those rules you cannot work alone.