1. A musical instrument with a fan-folded zigzagged air bag characteristic of the accordion family.
2. Figuratively, any object or shape resembling the unique appearance of accordions (for example, z-foldable doors, buses or trains with ruffled interconnecting segments, air-blowing devices, etc⋅). Specifically: An articulated bus comprising two or more rigid sections linked by a pivoting joint (articulation) enclosed by protective bellows inside and outside and a cover plate on the floor; banana bus; bendy bus; tandem bus; vestibule bus; wiggle wagon; stretch bus; accordion bus.
Bruno scouted out a suitable bench and looked forward to the squeezebox-like bus's next expectable circus schtick. (Context: A long bendy bus has destroyed flowers in front of the school. Bruno seats himself on a bench, wanting to see what is coming next. Source: J∙ Okram - The Mystery of the Rammed Key.)