screw noun definition in How machines work topic from the Oxford Advanced Learner's Dictionary


 noun: How machines work topic
[countable] a thin pointed piece of metal like a nail with a raised spiral line (called a thread ) along it and a line or cross cut into its head. Screws are turned and pressed into wood, metal, etc. with a screwdriver in order to fasten two things together. One of the screws is loose. Now tighten all the screws.

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