noun

1. any implement, instrument, or utensil held in the hand and used to form, shape, fasten, add to, take away from, or otherwise change something by cutting, hitting, digging, rubbing, etc.: knives, saws, hammers, shovels, rakes, etc. are tools
2. 1. any similar instrument that is the working part of a power-driven machine, as a drill, band-saw blade, etc.
   2. the whole machine; machine tool
3. anything that serves in the manner of a tool; a means books are a scholar's tools
4. a person used to accomplish another's purposes, esp. when these are illegal or unethical; dupe; stooge
5. Slang the penis: somewhat vulgar
6. Law any instrument or device necessary to one's profession or occupation
   in full tools of one's trade

Etymology: ME toole < OE tol, akin to ON tol < ? IE base *deu- > taw

transitive verb

1. to form, shape, or work with a tool
2. to provide tools or machinery for (a factory, industry, etc.): often with up
3. 1. to drive (a vehicle)
   2. to convey (a person) in a vehicle
4. to impress letters or designs on (leather, a book cover, etc.) with special tools

intransitive verb

1. to use a tool or tools
2. to get or install the tools, equipment, etc. needed: often with up
3. to ride or drive in a vehicle