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Gravity DependentPlay
The noun form of 'siphon' relies on gravity to work, like sucking liquid through a straw. SlideThe mechanic needed a siphon to empty the gasoline tank.
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Flow DirectionPlay
'Siphon' implies a liquid moving from a higher area to a lower one without a pump. SlideAfter the rain, we used a siphon to remove water from the cover.
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Initiating ProcessPlay
Starting a siphon may require suction to begin the liquid flow. SlideHe started the siphon by sucking on the tube.