推し
Oshi
おし
Originally from 推しメン (oshi-men = your "recommended member"), used by idol fans to refer to their favorite member in a group. It means "the person you support and root for the most." In the 2020s, it expanded far beyond idols — you can have an 推し for anime characters, artists, YouTubers, food, places, basically anything you are passionate about. 推し活 (oshi-katsu = "oshi activities," supporting your oshi) has become a major keyword driving Japanese consumer culture, from buying merch to traveling to events.
Examples
推しのライブのチケット取れた！泣きそう
I got tickets to my oshi's concert! I could cry!
Telling a friend the good news over LINE
推しが誕生日だからケーキ買ってきた
It is my oshi's birthday so I bought a cake.
Chatting with fellow fans
推しのいない人生、考えられない
I cannot imagine life without an oshi.
最近の推しは韓国のアイドルなんだ
My current oshi is a K-pop idol.