A tube used to move a liquid from one container to another by making the liquid go up and over the edge of the first container.
A syphon is a tool that helps move liquid from one place to another, often used for things like taking gas from a car.
Examples:
I used a syphon to move the water from one bucket to another.
We can syphon the gas from the car to the can.
The syphon is long and made of clear plastic.
I tried to syphon the juice from the bottle, but it didn't work!
With a syphon, you can move water from a big pool to a small cup.
He used a syphon to take the water from the fish tank.