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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.