• (v. t.) A large anchor stowed on shores outside the waist of a vessel; -- called also waist anchor. See the Note under Anchor. • (v. t.) Anything regarded as a sure support or dependence in danger; the best hope or refuge. Found on http://thinkexist.com/dictionary/meaning/sheet_anchor/
Sheet' an'chor [ Middle English scheten to shoot, Anglo-Saxon sceótan ; confer Middle English shoot anchor . See Shoot , transitive verb ] 1. (Nautical) A large anchor stowed on shores outside the waist of a vessel; -- called also waist anchor . See t... Found on http://www.encyclo.co.uk/webster/S/85