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

tool

noun
 
/tuːl/
 
/tuːl/
Idioms
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  1. an instrument such as a hammer, screwdriver, saw, etc. that you hold in your hand and use for making things, repairing things, etc.
    • garden tools
    • a cutting tool
    • Always select the right tool for the job.
    • craftsmen using traditional tools
    • a set of tools
    see also machine tool, power tool
    Oxford Collocations Dictionaryadjective
    • general-purpose
    • multi-purpose
    • basic
    … of tools
    • set
    verb + tool
    • use
    • sharpen
    • down tools
    See full entry
  2. a thing that helps you to do your job or to achieve something
    • research tools like questionnaires
    • a marketing/management tool
    • The internet can be a powerful teaching tool.
    • a useful/valuable tool
    • 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 tool
    • An email newsletter can be a very effective communication tool.
    • They need to use all the tools at their disposal.
    Extra Examples
    • The internet has become a vital tool for many artists.
    • This dictionary is a great reference tool for advanced learners.
    • We must ensure that education is not used as a political tool.
    • a valuable diagnostic tool for physicians
    • Technology provides tools to enhance teaching.
    • They are developing new software tools.
    Oxford Collocations Dictionaryadjective
    • new
    • effective
    • essential
    verb + tool
    • become
    • develop
    • provide
    phrases
    • the tools of the/​somebody’s trade
    See full entry
  3. a person who is used or controlled by another person or group
    • The prime minister was an unwitting tool of the president.
  4. (taboo, slang) a penis
  5. Word OriginOld English tōl, from a Germanic base meaning ‘prepare’. The verb dates from the early 19th cent.
Idioms
down tools
  1. (British English) (of workers) to stop work; to go on strike
not the sharpest tool in the box | not the sharpest knife in the drawer
  1. (informal, humorous) not intelligent
    • He's not exactly the sharpest tool in the box, is he?
See tool in the Oxford Advanced American DictionarySee tool in the Oxford Learner's Dictionary of Academic English
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