A LOVER's quarrel is a disagreement between two people in a romantic relationship. It is often characterized by heated arguments and can be caused by a variety of issues. The term 'LOVER's quarrel' can be broken down into two words: 'TIFF' and 'SPAT'. 'TIFF' is an acronym for 'TIFFANY', which is a type of jewelry given as a token of love or affection. 'SPAT' is a verb meaning to have a brief argument or disagreement. Therefore, a LOVER's quarrel can be defined as a brief argument or disagreement between two people in a romantic relationship, often caused by issues related to love or affection.