N-COUNT A tap is a device that controls the flow of a liquid or gas from a pipe or container, for example, on a sink or on a cask or barrel.
PHRASE tap (into) sth to make use of a source of energy, knowledge, etc. that already exists 利用，开发，发掘（已有的资源、知识等）;
- Tap into the wealth of knowledge hiding in your quietest team members;
- tap water