入關

to enter a pass / to go through customs

to enter / to go into / to join / to become a member of / to confirm or agree with / abbr. for 入聲|入声[ru4 sheng1]

mountain pass / to close; to shut; to turn off / to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc) / to concern; to involve

theory proposed in 2019 on Chinese social media, centering on the idea of China replacing the United States as the dominant nation in a new world order, drawing an analogy with the Manchu overthrow of the Ming dynasty, achieved after the Qing army entered China via the Shanhai Pass 入關|入关[ru4 guan1]