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1)cave　/ keɪv; kev/ n

hollow place in the side of a cliff or hill, or underground 洞穴.

2)cave v

[I] (usu 通常作 go caving) explore caves as a sport 洞穴探险运动

eg：He likes caving. 他喜欢洞穴探险运动.

(phr v) cave in fall inwards; collapse 塌陷; 坍方; 坍塌

eg：The roof of the tunnel caved in (on the workmen). 隧道顶坍塌(压住工人).

eg：(fig 比喻) All opposition to the scheme has caved in. 所有反对这一计划的意见都否定了.

cave-dweller n = caveman.

cave-in n sudden collapse of a roof, etc (屋顶等)突然坍塌.

3)caveman / ˈkeɪvmn; ˋkevˏmæn/ n (pl -men / ˈkeɪvmen; ˋkevˏmɛn/)

1 person living in caves, esp in prehistoric times 穴居人(尤指史前时代的).

2 (infml 口) man of crude or violent feelings and behaviour 野蛮人; 粗野的人.