[f. LAP v.4] The action or process of grinding or polishing on a ‘lap.’
1877. Gee, Pract. Gold-worker, 178. Lapping … is a distinct process of finishing jewellery.
1879. Cassell’s Techn. Educ., IV. 350/2. ‘Lapping’ … consists in grinding small facets such as those cut on a diamond to bring up its lustre, and which are cut on the gold for the same reason.
1886. Walsingham & Payne-Gallwey, Shooting, I. iv. 69. A barrel … undergoes three distinct stages, viz.: rough-boring; fine-boring; and polishing or lapping.
