verb, particle · to lock up or shut someone or something in a restricted space

那只鸟被关在笼子里。

verb, noun · to close, shut, or turn off a device or opening

请离开时记得关灯。

verb, preposition · to involve, relate to, or have an effect on

这件事与你无关。

noun, idiom · a figurative or metaphorical barrier, challenge, or ordeal that one must overcome

人生的难关都要靠自己闯过去。

noun · a strategic pass, gateway, or border fortification

将士们日夜守卫着这道雄关。

proper name · surname Guan

关先生是我们的经理。

noun · in TCM pulse-taking, the middle position corresponding to the radial styloid process

中医切脉讲究寸、关、尺三个部位。