HSK 3.0 · LEVEL 1
关上
To close, to shut, or to turn off (a light/device).
Free Chinese vocabulary flashcard · HSK 1
Why does 关上 look like this?
Originally a door (门) with a horizontal bar to 'close' it. The modern form 关 represents the bar/latch. Together with 上 (up/on), it forms the action of closing something tight!