pitch (n.2)youdaoicibaDictYouDict[pitch 词源字典]
"resinous substance, wood tar," late 12c., pich, from Old English pic "pitch," from a Germanic borrowing (Old Saxon and Old Frisian pik, Middle Dutch pik, Dutch pek, Old High German pek, German Pech, Old Norse bik) of Latin pix (genitive picis) "pitch," which according to Watkins is from a PIE root *pik- "pitch" (cognates: Greek pissa, Lithuanian pikis, Old Church Slavonic piklu "pitch"), but according to Pokorny this is from the same PIE root as pine (n.). The English word was applied to pine resins from late 14c. Pitch-black is attested from 1590s; pitch-dark from 1680s.[pitch etymology, pitch origin, 英语词源]