吃了秤砣铁了心

吃了秤砣铁了心

Literally means:

eat the weight, iron heart

Actually means:

be unshakable in one's determination; be resolute

This phrase originally comes from a proverb"王八吃秤砣—铁了心 (after a turtle swallow a block of counterbalance into its throat, his heart seems as hard as iron)".

Metaphorically it refers to a person who is hidebound in doing things and refuses to change direction even proved to be wrong.

It figuratively means that one has made up his mind and will not change in any way.

来自歇后语“王八吃秤砣—铁了心”。

王八一旦咬住了东西就会咬着不放;用来形容做事死板，不懂得变通，或即使错了也不改。

比喻已经打定了的主意，无法改变。