The Collaborative International Dictionary
Withset
Withset \With*set"\, v. t.
To set against; to oppose. [Obs.] ``Their way he them
withset.''
--R. of Brunne.
Wiktionary
withset
vb. 1 (context obsolete transitive English) To set oneself against; oppose; resist. 2 (context obsolete intransitive English) To be set against. 3 (context transitive UK dialectal Scotland English) To set (a place) with an ambush.