Big-Time SHOCK is a term used to describe a traumatic event that has a significant impact on an individual or group. The term can be broken down into two parts: 'big-time' and 'SHOCK'. The former refers to the magnitude of the event, while the latter refers to the suddenness and intensity of the experience. The crossword solution for this term is TRAUMA, which is defined as a deeply distressing or disturbing experience. TRAUMA can have both physical and psychological effects, and can lead to long-term mental health issues.