concertina

noun

Plural: concertinas

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.

Examples:

As soon as the first autobus had successfully departed, the concertina bus returned. Bending clumsily in the middle, it crawled towards the school building. (Source: J∙ Okram - The Mystery of the Rammed Key.)

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Julion Okram's Word Explainer is a concise dictionary of uncommon, less standard and expert words appearing in mystery thrillers and science fiction adventures. It contains little-known or fictional geographical names, scientific terms, slang, professional jargons, archaisms, dialects, neologisms, composite expressions, etc⋅. Find word definitions, alternative meanings, occasional notes about etymology and stems, and story-related contextual remarks. The entire vocabulary is searchable online. Readers wishing to go offline or have a printed reference at hand can download this full glossary as a wordbook in PDF format.