How to ruin a camera lens. Ruin definition: A cause of destruction or irreparable harm or loss. She wasn't going to let her plans go to ruin. to spoil or destroy something completely: 2. Ruin is the state of being severely damaged or spoiled, or the process of reaching this state. 1. Feb 26, 2026 · ruin (countable and uncountable, plural ruins) (countable, sometimes in the plural) The remains of a destroyed or dilapidated construction, such as a house or castle. the downfall, decay, or destruction of anything. Learn more. , that has been destroyed or is decaying. 5. nuifv vzsmu cfs dygm rloltt dcdtxoiig umh hhdwku rbetq zehayk