v. (past grew; past part grown)1 increase in size, height, quantity, degree, etc. 2 develop or exist as a living plant or natural product. 3 a produce (plants etc.) by cultivation. b allow (a beard etc.) to develop. 4 become gradually (grow rich). 5 (foll. by on) become gradually more favoured by. 6 (in passive; foil. by over etc.) be covered with a growth.. grow out of 1 become too large to wear. 2 become too mature to retain (a habit etc.). 3 develop from. grow up 1 advance to maturity. 2 (of a custom) arise. [Old English]