From Middle Englishther-aboute, ther-abouten(“of a place or an object: around there, in its vicinity; surrounding it; nearby, neighbouring; here and there, throughout that place; of an action, matter, etc.: about, concerning; of an amount or distance: approximately, more or less; of time: about then, around that time”)[and other forms],[1] from Old Englishþǣr-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]
And they entred in, and found not the body of the Lord Jeſus. And it came to paſſe, as they were much perplexed thereabout, behold, two men ſtood by them in ſhining garments.