From under- + lock. <span class="searchmatch">underlock</span> (plural <span class="searchmatch">underlocks</span>) A lock of wool hanging under the belly of a sheep. 1839, British Farmer's Magazine, volume 3, page 187:...
<span class="searchmatch">underlocks</span> plural of <span class="searchmatch">underlock</span>...
Farmer's Magazine, volume 3, page 187: No cloggings, lumps of dirt, or <span class="searchmatch">underlocks</span> should be suffered to be rolled up with the fleece, as such a practice...
Farmer's Magazine, volume 3, page 187: No cloggings, lumps of dirt, or <span class="searchmatch">underlocks</span> should be suffered to be rolled up with the fleece, as such a practice...