tool1 S2 W2 [countable]
something that you hold in your hand and use to do a particular job:
I don't have the right tools to start fiddling around with the engine.
a shop selling garden tools
a piece of equipment or a skill that is useful for doing your job:
Television is an important tool for the modern teacher.
These books are the tools of my trade (=the things I need to do my job).
someone who is used unfairly by another person and who has to do things they do not really want to do - used to show disapproval
The king was merely a tool of the military government.
4 informal not polite
a man's penis (=sex organ)