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Comprehensive
Dictionary Suite
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lighten1 to add light to; brighten (something) up. [1/3 definitions]
liven to become more lively or energetic; brighten (usu. fol. by "up"). [1/2 definitions]
smile to have a facial expression in which the corners of the mouth turn up and the eyes brighten, usu. to express pleasure, happiness, or amusement, but sometimes to express derision. [1/6 definitions]