As a Noun: 1. A weakness or imperfection in someone's character. English = fault. 2. A broken part or a mistake in the way a machine or structure is made. English = fault. 3. A bad or undesirable situation for which you are responsible. English = fault. As a Verb or Adjective: 1. To be wrong, to be responsible for some error. English = (be) at fault. 2. To be broken or not working properly. English = (be) faulty.