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Pronunciation

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Singular
tool

Plural
tools

Tool is on the Academic Vocabulary List.
 
Various tools
  1. (countable) A tool is an object that you use to do a specific job, such as a hammer.
    I used to fix my own car, but I sold all my tools.
  2. (countable) (slang) A tool is a person being used by another person or organization.
    He is such a tool. He should think for himself, instead of doing everything they tell him to do.

Plain form
tool

Third-person singular
tools

Past tense
tooled

Past participle
tooled

Present participle
tooling