After telling a story about something so funny it made the person "crack up," my daughter asked if the person really got cracks in them. "No, it's just an expression that means you laugh really hard." Still looking puzzled, she said . . . "yeah, I thought so."
Recently during her speech therapy they worked on the meanings of several different expressions. And I am very thankful that our insurance is covering the sessions now (her doctor filled out a 'medical necessity' form).