The term 'becomes fixed' can be represented by the crossword solution 'sets'. This verb means to make something firm, stable, or stationary. It is often used in reference to objects that are being placed in a certain position or arrangement. For example, one might say 'I set the table for dinner' or 'I set the books on the shelf'. In other contexts, it can also mean to establish something as a rule or standard. For example, one might say 'We set a curfew for our children' or 'The government has set a minimum wage'.