crack in this sentence

Today I read article and there is one word I cannot catch the exact meaning for it

The sentence is" we might tell you that we need to crack your chest open to repair your damaged heart valve "

Allah save us all from it

But what does " crack " here mean ?

if we say crack mean open sentence will be we need to open your chest open ! how is that

Mar 6, 2017 9:49 AM
Comments · 2
Think of things you need to crack open when you want get inside: eggs, nuts, coconuts and so on.  I think the speaker is using "crack" in a slightly figurative way, but then again we have the sternum and ribcage protecting the heart... and bones crack too.
March 6, 2017

@ Peachey

Thanks a lot teacher Now I understand

March 7, 2017