A faucet is a device that allows you to turn the flow of water on and off. The faucet is not just the metal part that the water comes through, it is the whole mechanism for controlling the flow of water. If you cry easily, someone might say you are a regular faucet.A faucet is a device that controls the flow of a liquid or gas from a pipe or container. Sinks and baths have faucets attached to them. She turned off the faucet and dried her hands.The definition of a faucet is a device that controls the flow of liquid. An example of a faucet is where the water flows into a sink. noun. 1. (North America) An exposed plumbing fitting; a tap or spigot; a regulator for controlling the flow of a liquid from a reservoir.