The phrase 'close for comfort' is an idiom that means something is TOO close or TOO near for comfort. It is often used to describe a situation where someone feels uncomfortable because something is TOO close to them, either physically or emotionally. The crossword solution for this phrase is 'TOO', which is a three-letter word that means 'EXCESSIVELY'. This phrase is often used to express a feeling of unease or discomfort when something is TOO close or TOO near.