The meaning of grinning from ear to ear

“From ear to ear” means that a person is laughing so hard that he cannot close his mouth.

Source:

1. Lu Yao: "How could his parents be so happy that they couldn't open their mouths from ear to ear?"

2. Xiong Zhaozheng's "Zhang Juzheng": "He took a deep breath and looked at You Qi, who was so nervous that he couldn't close his mouth from ear to ear."

Chinese sentences with his mouth from ear to ear:

1. My sister was so happy that she couldn't close her eyebrows. Mouth, it seems that it has benefited from something to make it so happy.

2. Grandma loves to laugh, and she can’t close her mouth from ear to ear when she smiles. At this time, you can see that there are only a few "guard" front teeth left in her mouth.

3. Sorghum smiled with a red face, as if he had been praised by others and smiled happily from ear to ear.

4. One of his jokes made everyone laugh from ear to ear.