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From The Collaborative International Dictionary of English v.0.48:
Outgrow \Out*grow"\, v. t. [imp. Outgrew; p. p. Outgrown; p. pr. & vb. n. Outgrowing.] [1913 Webster] 1. To surpass in growing; to grow more than. --Shak. [1913 Webster] 2. To grow out of or away from; to grow too large, or too aged, for; as, to outgrow clothing; to outgrow usefulness; to outgrow an infirmity. [1913 Webster]