köken: From Middle High German böugen, from Old High German bougen, from Proto-Germanic *baugijaną. In early modern German, almost fully merged with related biegen, which used to have the strong 2nd and 3rd persons singular du beugst, er beugt (compare similar archaic forms like du fleugst from fliegen). The later grammarians tried to distinguish the verbs again, though often in ways different from the…
köken: Equivalent to duo (“two”) + -plex (“-fold”). Possibly inherited from Proto-Italic *dupleks, if Umbrian 𐌕𐌖𐌐𐌋𐌀𐌊 (tuplak) is cognate (however, its meaning is uncertain and its form poses some difficulty). The Italic form may be an analogical alteration (with the du- of duo replacing *dwi-) of an original Proto-Indo-European *dwi-pleḱ-s; compare Ancient Greek δίπλαξ (díplax).
aile: duplicō
Duplex omnīnō est iocandī genus, ūnum illīberāle, petulāns, flāgitiōsum, obscēnum, alterum ēlegāns, urbānum, ingeniōsum, facētum.
köken: From Middle Low German boie, Middle Dutch boeye, from Old French buie (“fetter, chain”) (French bouée). This word is probably borrowed from Frankish *baukn, cognate with English beacon and Old Frisian bāken. Doublet of bavn and båke).
köken: From Proto-Vietic *toːj, a non-Sino-Vietnamese reading of Chinese 對 (“pair, double”, SV: đối). Doublet of tụi. Compare Iu Mien doix (“classifier for pairs or couples”).