出典:Wiktionary
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”).
gainset (三人称単数 現在形 gainsets, 現在分詞 gainsetting, 過去形および過去分詞形 gainset)