The term 'hold together firmly' can be summarized by the word 'COHERE, ' which is a six-letter word. COHERE is defined as 'to stick together; to form a united whole.' This term is often used in the context of relationships, such as when two people are in a strong bond or when a group of people are united in a common cause. It can also be used to describe physical objects, such as when two pieces of material are held together firmly. In either case, COHERE implies a strong connection between two or more entities.