gainset
To set over against; oppose.
archaic, rare, transitive
This humour aideth the vnderstanding with two qualities, and gainsetteth it selfe only with one.
Where it comes from
From Middle English gaynsetten, yensetten (also aȝeynesetten (“to oppose”)), equivalent to gain- + set. Cognate with archaic German gegensetzen (“to oppose”) (whence entgegensetzen), German Gegensatz (“opposition”).
Adapted from the Wiktionary entry gainset (CC BY-SA 4.0).