true - to bring or restore to a desired mechanical accuracy or form ... (trued an unbalanced grinding wheel with a dressing diamond), true - to make true, as a piece of mechanism or the like; to place, adjust, or shape accurately; to give the precise required form or position to; to make accurately or perfectly straight, level, round, smooth, sharp, etc. as required, nürinenud metallilõikeriistade (lihvketta, lõiketera, freesi, puuri vms.) lõikevõime taastamine