Can someone explain effaced to me??

So I went to Dr and I'm 40% effaced and I just don't understand what it means😫 like I know it's my cervix thinning but.....can someone explain it a different way? That doesn't mean anything to me, I'm sorry if it sounds dumb, I just don't understand the effaced part when ppl keep saying its the thinning of the cervix....:(

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