To "ruin" something means to spoil, destroy, or cause to be useless. The term "ruin" or "ruins" refers to the rubble and spoiled remains of something that has been destroyed.
* Depending on the context, "to ruin" could be translated as "to destroy" or "to spoil" or "to make useless" or "to break."
* The term "ruin" or "ruins" could be translated as "rubble" or "broken-down buildings" or "destroyed city" or "devastation" or "brokenness" or "destruction," depending on the context.