arrière

In a sentence

• Je suis assis à l'arrière de la voiture.

  I am sitting in the back of the car.

  The word 'arrière' here denotes 'back' as a location within the context of the vehicle, indicating a spatial position.

• Elle regarde souvent en arrière, se souvenant du passé.

  She often looks back, remembering the past.

  In this case, 'arrière' is used figuratively to indicate 'back' in the sense of reflecting on past times.

• Nous avons besoin d'un plan de secours, une option en arrière.

  We need a backup plan, an option in reserve.

  Here, 'arrière' connects to the idea of 'back' or 'reserve' in the context of having an additional option prepared.