knobbing
粗琢塊石
Knob·bing n. Stone Quarrying Rough dressing by knocking off knobs or projections.
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knob
n 1: a circular rounded projection or protuberance [syn: boss]
2: a round handle
3: any thickened enlargement [syn: node, thickening]
4: an ornament in the shape of a ball on the hilt of a sword or
dagger [syn: pommel]
[also: knobbing, knobbed]