Bleachers are raised seating, usually for sporting events, that's arranged in tiers. Your favorite way to spend a Friday evening might be sitting in the bleachers and cheering for a high school football team.
Bleachers are a set of benches made of wood or metal, used for inexpensive seating in gyms or beside sports fields. Students sometimes sit in the bleachers for a pep rally or speech, and soccer fans might gather before a game, choosing spots in the bleachers that give them a good view of the field. Since the late 19th century, bleachers has been used in the US, inspired by their typical wooden seats, bleached by the sun.