The crossword solution for the term INSTRUCTION AT MANY A CORNER is STOP, which is a four-letter word. STOP is a command that is used to indicate that someone should cease an action or activity. It is commonly used in traffic control, where it is used to indicate that drivers should STOP their vehicles at a certain point. It is also used in other contexts, such as in classrooms and workplaces, to indicate that people should pause and pay attention.