The term 'flattens' can be described as the act of making something level or even. This can be seen in the crossword solutions given, such as 'PLATEAUS' (8 letters), which is a landform that is flat on top, 'evens' (5 letters), which means to make something level, 'kos' (3 letters), which is a Hebrew unit of measure for distance, 'DECKS' (5 letters), which is a flat surface, 'IRONS' (5 letters), which is a tool used to press clothes and make them flat, 'RAZES' (5 letters), which means to demolish something completely, and 'evensout' (8 letters), which means to make something level or even. All of these words are related to the term 'flattens' in that they all describe the act of making something level or even.