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brighten up


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WordReference Random House Learner's Dictionary of American English © 2025
bright•en /ˈbraɪtən/USA pronunciation   v. 
    [no object* ~ + object]
  1. to become or make bright or brighter.
  2. to become or make more cheerful.
bright•en•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2025
bright•en  (brīt′n),USA pronunciation v.i., v.t. 
  1. to become or make bright or brighter.
  • Middle English brightnen. See bright, -en1 1250–1300
    lighten; cheer, gladden, lift, hearten, perk up.
    darken; deject, sadden.
Collins Concise English Dictionary © HarperCollins Publishers::
brighten / ˈbraɪtən/
  1. to make or become bright or brighter
  2. to make or become cheerful

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