The crossword solution for the term 'Restrained, with 'UP'' is PENT, which is a four-letter word. The term 'pent' is derived from the Greek word 'pente', meaning five, and is used to describe something that is confined or restricted. In this case, the term 'restrained, with 'UP'' implies that something is being held back or kept in check. This could refer to a person's emotions, behavior, or even physical movements.