Siphoning means moving a liquid from one place to another using a tube. It can also mean stealing something little by little, like money or information.
Siphoning can have a sneaky or dishonest feeling, especially when it's about stealing.
Examples:
I am siphoning gas from the car.
He is siphoning water from the fish tank.
She is siphoning the juice from the bottle.
They are siphoning all the good ideas from the book.
The magician is siphoning the water from one glass to another.
Stop siphoning my toys!