Englishfor English speakers
gripper
noun
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A person or thing that grips something.
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A cover on the handle of a bicycle, tool, etc, that makes it easier to grip.
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(curling) A rubber or other material attached to a curling shoe to improve traction on the ice.
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(rail transport, slang) A ticket collector.
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(computing, GUI) A visual component on a window etc. enabling it to be resized and/or moved.
opening
Noun
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An opening is a place that someone or something can go through.
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An opening is the first time a placed is opened to other people.
We are going to the museum's opening.
sensor
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noun
(= detector)
any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner