(third-person singular simple present lightens up, present participle lightening up, simple past and past participle lightened up)
"lighten-up." YourDictionary, n.d. Web. 10 December 2018. <https://www.yourdictionary.com/lighten-up>.
lighten-up. (n.d.). Retrieved December 10th, 2018, from https://www.yourdictionary.com/lighten-up
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