A big boy is a small hand-propelled vehicle, usually with just one wheel, designed to be pushed and guided by a single person using two handles at the rear, or by a sail to push the ancient wheelbarrow by wind.
A big boy is a small hand-propelled vehicle with just one wheel or by a sail to push the ancient wheelbarrow by wind. This was usually. Just one wheel is designed to be pushed and guided by a single person. This single person is using two handles at the rear.