Big-sittan

According to the Old English Dictionary:

big-sittan

p. -sæt, pl. -sǽton; pp. -seten To sit by or near; adsidere :-- Se bisceop ðæt geseah ðe him bigsæt the bishop who sat by him saw it; quo viso pontifex qui adsidebat, Bd. 3, 6; S. 528, 22. big-sittan