noun (wikipedia, crawler, crawler (tractor))
Etymology: (-er, crawl)tractor crawler is from "to crawl" " to move slowly, by dragging the body along the ground.
- a tractor crawler, a motorized vehicle that uses caterpillar tracks instead of wheels to achieve superior floatation and traction. Crawlers are more expensive in maintenance and harder to operate than wheel tractors, but are often critical for working on soft soils, transporting great weights, and especially for bulldoze, bulldozing.
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Full Definition of crawler