C1. attributive in sense 1. Used for dumping or depositing loads, as dumping-bucket, dumping-car, dumping-cart, dumping-machine, dumping-place, dumping-reel, dumping-sled, dumping-wagon.
ΚΠ
1874 E. H. KnightPract. Dict. Mech.Dumping-reel, an arrangement in a harvester for dropping the gavels of grain.
1883 Harper's Mag. May 829/1Dumping-place for city refuse.