v.1. To extend from a place by growing: I cut my hair short, but it will grow out again.
2. To cause something to become longer or thicker by growing it or letting it grow: I cut my hair short, but I'll grow it out again. He grew out his beard until his chin was completely covered.
3. grow out of To have developed to the point that one is too big or no longer suited to something: My son grew out of his shoes in three weeks.
4. grow out of To have developed in such a way that something is no longer interesting or appropriate: When I was young I liked eating bananas with pickles, but I grew out of it.