The term 'social opening' can refer to a variety of different things, but the crossword solution for it is 'ANTI, ' which is a four-letter word. Generally, 'ANTI' is used to describe something that is opposed to or against something else. In the context of social openings, it could refer to an attitude or behavior that is not welcoming or friendly. It could also refer to a person who is not open to new ideas or experiences.