rock away 是什么意思？

这要看上下文的意思了，下面三个例句你可以参考一下：

eg:The edge of the rock has chipped away.
这块岩石的边上已经脱落了。

eg:Water dropping day by day wear the hardest rock away.
日积月累，水滴石穿。

eg:The surface of the rock expands very slightly, but the inside of the rock, which is not heated, does not expand. This causes a little crack, and gradually little pieces of the rock break away.
岩石的表面膨胀很小，但是没有被加热的岩石的内部却不膨胀，这使得岩石产生细小裂缝，一片片小石头片将渐渐地剥蚀下来。

岩石

脱落