a.

1. 镇静的，沉着的
   You must try to be calm.

   你必须设法冷静下来。

2. 无风（浪）的；平静的
   The high wind passed and the sea was calm again.

   大风过后，大海又风平浪静了。

3. 安静的
4. 【口】厚脸皮的，狂妄的

n.[S][U]

1. 安静；镇定
2. 平静；无风
   There was a calm on the sea.

   海面上风平浪静。

vt.

1. 使镇定；使平静
   We calmed the old lady down.

   我们使老太太平静下来。

vi.

1. 镇定下来；平静下来
   Calm down, sir. What's the trouble?

   冷静点，先生。出了什么事？

adj.

1. not showing or feeling nervousness, anger, or other emotions.
2. (of a place) peaceful and undisturbed.
   ▸(of weather or the sea) free from wind.

n.

1. the state or fact of being peaceful or tranquil.
2. the absence of wind.
   ▸ (calms) an area of the sea without wind.

v.