The term 'allied (with)' can be defined by two crossword solutions: 'SIDED' (5 letters) and 'inleague' (8 letters). The term 'allied (with)' is used to describe a relationship between two or more parties that are working together for a common purpose. This could be a political, military, or economic alliance. The word 'SIDED' implies that the parties are on the same side, while the word 'inleague' suggests that they are in a league or partnership.