What is "umbecast"

Umbecast \Um"be*cast`\, v. i. [Umbe + cast.] To cast about; to consider; to ponder. [Obs.]
--Sir T. Malory.

vb. 1 (context transitive intransitive obsolete or dialectal English) To cast about; make a circuit; travel around (a place). 2 (context transitive intransitive obsolete or dialectal English) To consider, ponder. 3 To hunt, search for the spoor, explore, seek, sniff around. 4 To surround, encircle, beset; umbeset, circle around. 5 To bind, tie up. 6 To cast a shadow, cover with a shadow, shade