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| Definitions from the WebTerm: Tighten UpDescription:Tighten up is a slang term that originated in African-American English. It has multiple senses and can be used as a verb, adjective, or noun. In general, it means to make something more organized, efficient, or secure by making it tighter or stricter. Sample Sentences:Verb: 
 Adjective: 
 Noun: 
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| tight-lipped tight-race tight tight end tight fisted tight money tighten tighten one s belt tighten up tightened tightening tightens tighter tightest tightfisted-ness tightfisted tightfistedness 
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