Clauson (1972)
An etimological dictionary of pre-thirteenth-century Turkish
p. 294
D bıçuk
Pass. N./A.S. fr. biç-; properly ‘cut’, but usually ‘half’, cf. yarım. The word is unvocalized in Kaş., but was prob. still spelt bıçuk; in the medieval period it tended to become buçuk by regressive assimilation. Survives in SE Türki puçuk ‘snub-nosed’ Shaw 58; ditto and ‘with broken edges’ BŞ 127; ‘a piece; dilapidated’ Jarring 232, and SW Osm. buçuk ‘half’. Xak. xi bıçuk(?) ‘anything cut’ (maqṭū‘); hence ‘half anything’ (niṣf kull şay’) is called bıçuk; one says bıçuk yarma:k ‘half a dirham’ Kaş. I 377: xiv Muh. (under al-bā’u’l-maqṣūra) al-maqṭū‘ bı:çuk Mel. 82, 17; Rif. 189; niṣfu’l-layl ‘midnight’ dü:n bu:çu:kı: 80, 8; 185: Çağ. xv ff. buçuğ/buçuk kasī ki bīnī-yi ū macrūḥ gaşta ma‘yūb şuda ‘a man whose nose has been injured and has become disfigured’ San. 130v. 16: Xwar. xiv buçuk batman ‘half a batman’ Nahc. 97, 7: Kıp. xiii al-niṣf buçuk Hou. 23, 1: xiv buçuk (‘with -ç-’) al-niṣf İd. 29; al-niṣf (yarım?) Tkm. buçuk Bul. 9, 2: xv al-niṣf bışuk (sic); some people say ya:rum; the latter is used only to qualify a noun (muḍāfa(n)), but buşuk (sic) is used both that way and in isolation (mufrida(n)) Kav. 64, 19; niṣf buçuk (and yarım) Tuh. 36b. 6; 62b. 3: Osm. xiv ff. buçuk ‘half’; c.i.a.p. TTS I 119; II 171; III 113; IV 127: xviii buçuğ/buçuk . . . and, in Rūmi, niṣf San. 130v. 16.