intransitive verb
Definition: To make a light sound or touch, often by hitting something gently.
Example: She likes to tap her fingers on the table when she is thinking.
noun
Definition: A light touch or hit, often used to describe a gentle blow or a device that allows access to a resource, such as a spigot or a part of a circuit.
Example: She gave the door a quick tap to get someone's attention.
transitive verb
Definition: To hit something lightly or to draw liquid from a container.
Example: He decided to tap the keg for the party.