Verb
coolen (third-person singular simple present coolens, present participle coolening, simple past and past participle coolened)
(transitive, intransitive, rare, nonstandard) To make or become cool.
While Coolen is beginning to make a name for herself in the varsity ranks for the Mustangs, her name has been well-known through the youth athletic realm in Waldo County for several years. Source: Internet