drill (n.3)youdaoicibaDictYouDict[drill 词源字典]
kind of coarse, twilled cloth, 1743, from French drill, from German drillich "heavy, coarse cotton or linen fabric," from Old High German adjective drilich "threefold," from Latin trilix (genitive trilicis) "triply twilled" (see trellis). So called in reference to the method of weaving it.[drill etymology, drill origin, 英语词源]
triple (adj.)youdaoicibaDictYouDict
early 15c., from Old French triple or directly from Latin triplus (see triple (adj.)). As a noun, early 15c., "a triple sum or quantity," from the adjective. The baseball sense of "a three-base hit" is attested from 1880. Related: Triply (adv.). Triple-decker is from 1940 of sandwiches and wedding cakes, 1942 of beds.