The crossword solution for the term 'BEGIN TO MELT' is THAW, which is a four-letter word. Thawing is the process of melting ice or frozen substances, such as snow, ice cubes, and frozen food. It is the opposite of freezing, which is the process of cooling something to a temperature below its freezing point. Thawing can be done naturally, by exposing the substance to warmer temperatures, or artificially, by using a heating device.