1. drew out or transferred liquid through a tube using atmospheric pressure or suction
2. gradually took away or diverted something, especially money or resources
Usage: often implies unauthorized or secretive removal

Examples

• The mechanic siphoned the old gas from the tank.
• They siphoned water from the flooded basement.
• The corrupt official siphoned funds from the charity.
• Gas prices rose after thieves siphoned fuel from parked cars.
• The company siphoned profits to offshore accounts.
• She siphoned the wine into smaller bottles for storage.
• Investigators discovered he had siphoned money over several years.