The term 'come into use' can be summarized by the crossword solution 'INURE, ' which is a five-letter word. INURE means to become accustomed to something, usually an unpleasant situation, over time. It is often used in reference to people becoming accustomed to a certain lifestyle or situation, such as poverty or a difficult job. INURE can also be used to describe how people become accustomed to certain behaviors or habits.