(third-person singular simple present perks up, present participle perking up, simple past and past participle perked up)
"perk-up." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/perk-up>.
perk-up. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/perk-up
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