Definition of grow out of
1 : to develop or come from (a source) The project grew out of a simple suggestion. This new theory grew out of their earlier research.
2 : to become too large for (a certain size of clothing) He quickly grew out of his clothes.
3 : to stop doing or having (something) because one is older and more mature She hoped to grow out of her bad habits. He's wild now, but he'll grow out of it.
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