Backtracking

Backtracking refers to the situation where a traveler must reverse a part of their journey or return to a previous location. This can happen for several reasons, such as itinerary changes, emergencies, or unexpected events. Travelers may also need to backtrack if they miss a connecting flight or train or if a planned segment of their journey is canceled.

Backtracking can involve going back to an earlier point in a trip, such as returning to a previously visited city or airport and then proceeding with the journey. 

For example, while traveling through Europe, a traveler initially visits Paris and then moves on to Brussels. After learning about a festival happening in Paris that they would like to attend, they decide to backtrack to the city for a day before continuing to their next destination.