To decamp means to leave suddenly or quickly, often to avoid something unpleasant or to move on to something better. When a family decamps from a crowded beach because a storm is rolling in, they pack up fast and head for shelter. When guests decamp after a long dinner party, they finally make their way toward the door after hours of conversation.

You might read about pioneers who decamped to head west, or about a group of friends who decamped to the kitchen when the movie got boring. The word works especially well when describing groups leaving together, though individuals can decamp too. When the final school bell rings and students decamp to their buses, everyone leaves at once with clear destinations in mind.

Unlike sneaking away or fleeing in panic, decamping suggests an organized exit, even if it happens quickly. You're not running scared; you're making a strategic move to be somewhere else.