listen: [OE] The Indo-European base *kludenoted ‘hearing’ (it is the ultimate source of English loud). From its extended form *kluswere derived in prehistoric Germanic the noun *khlustiz ‘hearing’, which eventually produced the now archaic English verb list ‘listen’, and the verb *khlusnōjan ‘hear’, which became English listen. => loud[listen etymology, listen origin, 英语词源]