1. spoil or destroy, something in a state of decline
Professional
Social
ruin your reputation/fall into ruin
To 'ruin' something means to destroy or sabotage something. The verb 'to ruin' can mean to reduce something such as a building into a state of collapse, decay or disrepair. As a noun, a 'ruin' refers to a building that is disintegrating or is in a state of disrepair.