The term 'FLAT FLOAT' is a combination of two words, 'FLAT' and 'FLOAT'. The first word, 'FLAT', means having a level surface without any bumps or protrusions. The second word, 'FLOAT', refers to the act of remaining on the surface of a liquid without sinking. Together, the two words form the term 'FLAT FLOAT', which is used to describe an object that is able to remain on the surface of a liquid without sinking. The crossword solution for this term is RAFT, which is a type of vessel that is designed to stay afloat on water.