siphon

Imagine an aquarium needing a water change—that's where a siphon comes in. A siphon is a tube or pipe that helps liquid move from one container to another, usually from a higher level to a lower one after the flow has been started. It uses gravity and pressure to keep the liquid moving. You might use one to drain a fish tank, move fuel from a tank (carefully), or empty water from a container. The word can also be used in a figurative way to describe money, time, or energy being drawn away little by little. It is all about a steady flow that carries something from one place to another, often quietly.

A siphon is a tube or pipe used to transfer liquid from one place to another, most often from a higher level to a lower one. The idea can seem a little magical at first: once the tube is filled and the flow is started, the liquid can rise over the edge of a container and then run down into another container below. This happens because gravity pulling on the liquid in the longer downward side helps keep the stream moving, while air pressure also plays a part. In many cases, the siphon needs to be primed first, meaning the tube must already be filled or the flow must be started before it can continue on its own.

Historically, siphons have been used for everything from ancient irrigation systems to modern engineering. Today, you will find them in everyday life: aquarium cleaning kits are essentially siphons, and many toilets utilize a siphoning action to clear the bowl efficiently.

However, "siphon" is perhaps even more common in its metaphorical sense, especially when used with the particle "off." To "siphon off" something means to gradually and often unfairly divert resources. For example, a corrupt official might "siphon off" public funds into a private bank account, or a high-stress job might "siphon off" all of your creative energy. Whether you are dealing with fluid dynamics or the subtle depletion of resources, the word siphon evokes the image of a steady, directed, and continuous flow.