What is the meaning of "get over" in the following sentence (Source: PHONICS PC COMICS Volume 3 Issue 1),
You two really grew a lot this year. I cannot get over how tall you both are. The doctor will be amazed at my two big boys!
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Does "I cannot get over how tall you both are" mean "I cannot know how tall you both are" or "I cannot overcome how tall you both are"?