Middle English word belouken comes from Proto-Indo-European *lewg-, Old English butan (Except for, but, unless Without, except.)

Detailed word origin of belouken

Dictionary entry	Language	Definition
*lewg-	Proto-Indo-European (ine-pro)
butan	Old English (ang)	Except for, but, unless Without, except.
*leukaną	Proto-Germanic (gem-pro)	To pluck; pull up.
lūcan	Old English (ang)
lucan	Old English (ang)	To lock.
belūcan	Old English (ang)
belucan	Old English (ang)	To end, stop, bring or come to an end, close, conclude.. To lock up, shut up a place, shut out, confine to a limit.
bilouken	Middle English (enm)

Words with the same origin as belouken