HSK 7-9
放水
fàngshuǐ动
to turn on the water; to let water out; (sports) to throw a game
农民打开水闸向田里放水。
Nóng mín dǎ kāi shuǐ zhá xiàng tián lǐ fàng shuǐ.
The farmer opened the sluice to release water into the field.
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Appears across levels (7-9) in the HSK 3.0 word list.