The crossword solution for the term 'CUP'S PARTNER' is SAUCER, which is a 6-letter word. A SAUCER is a small plate that is typically used to hold a cup or mug. It is usually made of ceramic, porcelain, or glass and is used to catch any liquid that may spill from the cup. Saucers are often used in formal settings, such as tea parties, to provide a place to set the cup and to protect the table from heat or spills.