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From the noun phrase lower case, which itself consists of an adjective modifying a noun; when used as a noun adjunct then, to make its syntactical function clearer/simpler, it is written as a single word or with a hyphen as a sort of chunking.
1990 April 28, Harry Hay, “Identifying As Gay ― Here's The Key”, in Gay Community News, page 5:
Sister Jadallah apologizes for being unable to bring her readers facts and figures on Palestinian Lesbianism (forgive my capital "L" in Lesbianism, but like my Black brothers I cannot bring myself to lower-casing our recently empowering accoutrements of our Gay identities)