tap
The word evokes a sense of precise, minimal contact. Whether it is a finger on a glass or a hand on a shoulder, there is a rhythmic or momentary quality to the action that distinguishes it from a punch or a push. It suggests a signal or a request for attention rather than an attempt to cause damage. In a technical or resource-based sense, the term shifts toward the idea of unlocking or accessing a hidden reservoir. This applies both to physical liquids like maple syrup and to abstract resources like a person's potential or a secret source of information.
Countable when referring to the physical hardware of a faucet in a house. Uncountable when referring to the water that comes out of the plumbing system.
Meanings
A device or valve that controls the flow of liquid from a pipe.
"Turn the tap off to save water."
To strike lightly and repeatedly.
"He tapped me on the shoulder to get my attention."
To draw liquid from a container or source.
"The company began to tap the new oil well."