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cave noun | verb
 1 
cave / kev ; keIv /noun C
1. a large natural hole in the side of a cliff or hill, or under the ground洞穴,山洞,岩洞; 洞:
the entrance to a cave洞穴的入口

 2 
caveverb
 PHRASAL VERBS 
cave in
1. if the top or sides of something cave in, they fall down or inwards塌落,坍塌,陷下:
[+ on ]
The roof of the tunnel caved in on them.隧道的顶部坍塌下来压住了他们。
2. to finally stop opposing something, especially because someone has persuaded or threatened you〔尤指因某人劝说或威胁而〕让步,屈服:
[+ to ]
The chairman is expected to cave in to pressure from shareholders.董事长估计会在股东的压力下作出让步。

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