Cuckoo/ˈkʊkuː/ Definition 1 of 4Pro Tip 1/2Bird Call Onomatopoeia The word 'cuckoo' mimics the sound the bird makes, known as onomatopoeia. The cuckoo's call echoes 'cuckoo' in the spring woods. Pro Tip 2/2Seasonal Reference 'Cuckoo' can signify the arrival of spring or change of season in poetry and literature. Poems about spring often mention the cuckoo's song.