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backfield
backfile
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background music
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backlash

back·lash [ bák làsh ] (plural back·lash·es)


noun 
Definition:
 
1. strong reaction: a strong adverse reaction among a group of people to an event, development, or trend, especially one that benefits another group

2. violent backward movement: a sudden violent backward jerking movement, e.g. when a cable breaks under strain

3. mechanical engineering recoil between machine parts: a jarring recoil that sometimes occurs when worn or badly fitting parts of a mechanism come together

4. mechanical engineering play between machine parts: excessive play between adjacent parts in a mechanism such as a set of gears, usually as a result of the parts being worn or badly fitted

5. fishing twisted fishing line: a tangle in a fishing line wound on a reel

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