From Middle English forthsetten, equivalent to forth- + set.
forthset (third-person singular simple present forthsets, present participle forthsetting, simple past and past participle forthset)
- (transitive) To set forth; present to view; display.
2003, Poul Anderson, Mother of Kings:
"The stillness I broke by myself when I spoke. Your warriors harked to my words, and they marked how I handled my praise of your high-flying days, and they'll not forget what I've now forthset."