出典:Wiktionary
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From Middle English ther-aboute, ther-abouten (“of a place または an object: around there, in its vicinity; surrounding it; nearby, neighbouring; here かつ there, throughout that place; of an action, matter, etc.: about, concerning; of an amount または distance: approximately, more または less; of time: about then, around that time”) [and other forms],[1] from 古期英語 þǣr-ābūtan, þǣr-onbūtan, from þǣr (“there”) (ultimately from Proto-Indo-European *só (“this; that”) + *-r) + abūtan, onbūtan (“about; round about; on; on the outside”) (from on- (prefix meaning ‘on; upon; there; thither; to’) (ultimately from Proto-Indo-European *h₂en- (“on; onto”)) + būtan (“just, merely, only”) (ultimately from Proto-Indo-European *h₁ep- + *úd (“away; out; outwards; upwards”))). The English word is analysable as there + about.[2]
thereabout (not comparable)