下
xià
Whatever went up has to come down: 下
The picture Stepping off the platform you were standing on and coming back down. 下 lifts off the platform and comes down out of it; 上 sets a foot on that platform and goes into it.
Where the picture shows up in 下
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step off the working day
我今天六点下班。
wǒ jīntiān liù diǎn xiàbān
I finish at six today.
Shutting the computer at six, lifting your feet off the office floor and walking out of the building
The mirror of 上班. You climbed onto the job; 下 is climbing back off.
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step down out of the bus
我在下一站下车。
wǒ zài xià yí zhàn xiàchē
I'm getting off at the next stop.
The bus door opening, your feet coming down the steps onto the pavement
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come down out of the sky
外面下雨了,带把伞吧。
wàimiàn xiàyǔ le, dài bǎ sǎn ba
It's raining out — take an umbrella.
Raindrops breaking loose from the cloud and coming down onto umbrellas and street
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set the order down
我已经下单了。
wǒ yǐjīng xiàdān le
I've already placed the order.
A finger pressing the order button and the order dropping onto the shop's counter
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bring it down from up there
这个文件下载不了。
zhège wénjiàn xiàzài bu liǎo
This file won't download.
A file floating on a server sliding down the wire and settling onto your screen
All of it in one picture
下 is stepping off the platform you were up on and landing lower. Step off the working day and you have finished work; step off the bus floor and you have got out; let the water in the sky fall and it is raining. Set your order down on the shop's side and the order is placed; let the file up there settle onto your screen and it has downloaded. So wherever 下 appears, something that was up has left its place and come to rest below.