Also found in: Dictionary.
1. To fill something in with growth. Stop plucking your eyebrows and just let them grow in for once.
2. To develop some quality or characteristic to a greater degree. You'll grow in knowledge with every college class you take.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
grow in something
1. [for someone] to increase in some quality, such as wisdom, strength, stature, etc. As I got older, I was supposed to grow in wisdom and other good things. Sam grew in strength as he got over the disease.
2. [for a plant] to develop or flourish in something or some place. These plants grow in rich soil with moderate moisture. They will grow well in this soil.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To fill an area by growing extensively within it: We cut down too many of the bushes, but they will grow in again soon.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.