The act of making lower.

降低。

The sinking or falling in a surface; also, the hollow itself.

(表面之)凹陷；洼穴。

Low spirits.

(意气)消沉；沮丧。

Dullness of trade.

商业不景气。

An area where the pressure of the air is low in the center and higher towards the outside.

【气】低气压。