Clack/klæk/ Definition 1 of 4Pro Tip 1/3Onomatopoeic Origin The word 'clack' mimics the sound it describes, helping you remember its meaning. Every morning, the clack of the old typewriter fills the room. Pro Tip 2/3Sudden Noises 'Clack' often describes sounds that are sudden and surprising. A sudden clack startled the birds into flight. Pro Tip 3/3Mechanical Context Use 'clack' for mechanical objects like typewriters or keyboards, not softer sounds. She enjoyed the steady clack of the train on the tracks.