From Japanese 受け (uke), the 連(れん)用(よう)形(けい) (ren'yōkei, “stem or continuative form”) of the verb 受(う)ける (ukeru, “to receive, to get”).
Meanings
The training partner against whom tori performs a move.
(Japanese, slang) A passive or submissive male fictional character in a same-sex relationship; a bottom.
Yaoi uke in fanfics often bear the brunt of stereotypical "negative female characteristics" such as passivity, helplessness, and masochism. 2008, Tan Bee Kee, “Rewriting Gender and Sexuality in English-language Yaoi Fanfiction”, in Antonia Levi, Mark McHarry, Dru Pagliassotti, editors, Boys' Love Manga: Essays on the Sexual Ambiguity and Cross-Cultural Fandom of the Genre, McFarland & Company, →ISBN, page 142:
You'd rather have Sebas be an uke? 2010, Pentabu, My Girlfriend’s a Geek, volume 1, Yen Press, published 2012, →ISBN:
Shizuku is so, so, so cute! I love him as an uke so much I can't stand it! 2010, Kyoka Wakatsuki, “Afterword”, in The Selfish Demon King, Digital Manga Publishing, →ISBN, page 137: