Ruin, as a reputation, can be defined as the undoing or smearing of one's good name. It is often caused by negative actions or words that are said about someone, and it can have a lasting impact on their life. The crossword solutions for this term are 'UNDO' (4 letters) and 'SMEAR' (5 letters). Both of these words refer to the destruction of one's reputation, either through direct action or through the spreading of malicious rumors.