skylark UK /ˈskaɪlɑːk/US /ˈskaɪlɑɹk/noun 1verb 1forms 3 noun1 •A small brown passerine bird, Alauda arvensis, that sings as it flies high into the air. verb1 •(old-fashioned) To jump about joyfully, frolic; to play around, play tricks.I cherished no malice towards him, though he had been skylarking with me not a little in the matter of my bedfellow. — 1851 formsskylarked · skylarking · skylarks