thirlingEtymologyFrom Middle English thurlunge, from Old English þȳrlung (“piercing”), verbal noun of þȳrlian (“to pierce”). Equivalent to thirl + -ing.thirling means the act of boring or perforating. Lexicurio rates it Sui generis — a strength score of 88 out of 100.nounThe act of boring or perforatingSame as thirlIn lead-mining, a mark indicating the termination of a set or pitch