A child who has outgrown the internal harness or height limitations of a forward-facing child safety seat. Within the range of 40 to 80 pounds but under 4â9â. Within 4 to 8 years of age and is at least 35â tall.
tread. v. trod (trÅd) or treaded, trodÂ·den (trÅdâ²n) or trod or treaded, treadÂ·ing, treads. v. tr. 1. To walk on, over, or along: tread the pavement.
trundle. 1  to cause (a circular object) to roll along; roll. 2  to convey or move in a wagon, cart, or other wheeled vehicle; wheel: The farmer trundled his produce to market in a rickety wagon. 3  Archaic. to cause to rotate; twirl; spin. 4  to roll along. 5  to move or run on a wheel or wheels.