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quad bike - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

A quad bike

From quad (four (4)) +‎ bike (bicycle). From being a 4-wheeled quadricycle vehicle that is ridden astride like a dirt bike (motorcycle).

quad bike (plural quad bikes)

  1. A small off-road four-wheeled powered vehicle, especially of a design derived from a motorcycle, usually used for recreation or farm work.

small off-road four-wheeled powered vehicle