The term 'COOL CUBE' is a combination of two words, 'COOL' and 'CUBE'. The first word, 'COOL', is an adjective meaning 'very fashionable, attractive, or impressive'. The second word, 'CUBE', is a noun referring to a three-dimensional shape with six equal sides. Together, the two words form a phrase that describes something that is both fashionable and three-dimensional. The crossword solution for this term is 'ICE', which is a solid form of water that is often used to COOL drinks.