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1 `B' TRAIN: A TRACTOR pulling two SEMI TRAILERS. The lead unit having a FIFTH WHEEL at the back to attach the second SEMI TRAILER or PUP. (For photo: See `RIG'.)  BACKHOE: A, farm tractor with an EXCAVATOR on the back, and, usually, a bucket, front end loader, on the front.
instruct, discipline, teach, 1540s, probably from earlier sense of draw out and manipulate in order to bring to a desired form (late 14c.), specifically of the growth of branches, vines, etc. from mid-15c.; from train (n.). The meaning to travel by railway is recorded from 1856. Related: Trained; training.