Oxford Advanced American Dictionary

Definition of tool noun from the Oxford Advanced Learner's Dictionary

Oxford3000

tool

noun
tool pronunciation English tuːl tool pronunciation American tuːl
 
1 an instrument such as a hammer, screwdriver, saw, etc. that you hold in your hand and use for making things, repairing things, etcgarden toolsa cutting toolpower tools (= using electricity)Always select the right tool for the job.2 a thing that helps you to do your job or to achieve somethingresearch tools like questionnairesThe computer is now an invaluable tool for the family doctor.Some of them carried the guns which were the tools of their trade (= the things they needed to do their job).the effectiveness of interest rates as an economic tool3 a person who is used or controlled by another person or groupThe prime minister was an unwitting tool of the president.4 (taboo, slang) a penis
Idioms
see
down tools at down verb