threadbare

PIE word *bʰosós From Middle English thred-bar, thred-bare (“of cloth, clothing, etc.: worn to such an extent that the warp and weft threads show, shabby, worn-out; (figurative) inadequate, poor”) [and other forms], from thred (“piece of textile twine”) (from Old English þrǣd (“thread”), from Proto-Germanic þrēduz (“thread; twisted fibre”), ultimately from Proto-Indo-European terh₁- (“to drill, pierce; to rub; to turn, twist”)) + bar, bare (“naked, unclothed, bare; not covered”) (from Old English bær (“naked, bare; unconcealed”), ultimately from Proto-Germanic bazaz (“naked, bare”), from Proto-Indo-European bʰosós (“bare; barefoot”)). The English word is analysable as thread + bare.