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According to WordNet, the verb "lighten" has 6 sense(s).
200860136 become more cheerful; "after a glass of wine, he lightened up a bit".
201487573 reduce the weight on; make lighter; "she lightened the load on the tired donkey".
200312815 make lighter or brighter; "The paint will brighten the room".
200280930 become lighter; "The room lightened up".
200199067 alleviate or remove (pressure or stress) or make less oppressive; "relieve the pressure and the stress"; "lighten the burden of caring for her elderly parents".
201814074 make more cheerful; "the conversation lightened me up a bit".
Explore the word lighten on the WordNet web site.
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