Sǽt

According to the Old English Dictionary:

To judge by the former of the two passages given here the word in the latter of them should mean a place of concealment for the hunter where he lies in wait for the game which is driven towards him. Such driving of game is described by the hunter in Ælfric's Colloquy, Th. An. 21, 13-22, 18.

sǽt

Sǽte haldan would mean to keep the game from avoiding the ambush into which it was being driven. Cf. ge-sǽte. sæt