The term 'HOST's responsibility' can be broken down into two crossword solutions: INTRO (5 letters) and INTROS (6 letters). INTRO stands for introducing someone or something, while INTROS stands for introductions. As a HOST, it is their responsibility to introduce people or things to their guests. This could include introducing a speaker at an event, introducing a new product to customers, or introducing a new employee to the team. Hosts should also ensure that their guests feel welcome and comfortable in their environment.