The term 'hold firmly together' can be summarized by the word 'COHERE, ' which is a six-letter word. COHERE means to stick together, or to hold firmly together. It is often used to describe the relationship between different parts of a whole, such as the relationship between the members of a group or the components of a system. Coherence is also used to describe the relationship between ideas, such as the relationship between the different points in an argument.