Tiff/tɪf/ Definition 1 of 2Pro Tip 1/3Lightweight Quarrel A tiff is less serious than a fight and often short-lived. They quickly made up after their morning tiff. Pro Tip 2/3Casual Use Used in casual conversation, not usually formal situations. They often have a tiff about who does the dishes. Pro Tip 3/3Personal Context Commonly describes disagreements in personal relationships. The couple's tiff was over something trivial.