Submitted by Anonymous (not verified) on Thu, 10/26/2017 - 17:01 Lemma: darkenNgram Count: 1Wordnet ID: 33625Starts with letter: YesIndefinite Article: aGoogle Ngram Count: 1489246Sense count: 3Contained in other ngrams: 7Hierarchy: AdjectivePast ParticipleForms: darkeningdarkensForms Count: 2