下闸

下闸	xià zhá	lower sluice gate / outflow sluice
下	xià	down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action
闸	zhá	old variant of 闸 / sluice / lock (on waterway)
闸	zhá	sluice; sluice gate / to dam up water / (coll.) brake / (coll.) electric switch