Etymology
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outgrow (v.)

1590s, "to surpass in growth, grow taller than," from out- + grow (v.). In reference to clothing, etc., "to grow too large for, grow beyond the limits of," by 1690s. The figurative meaning "to become too large or too mature for, leave behind or lose in the process of growth or development" is attested from 1660s. Related: Outgrowing; outgrown.

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Definitions of outgrow

outgrow (v.)
grow too large or too mature for;
She outgrew her childish habits
I have outgrown these clothes
outgrow (v.)
grow faster than;
From wordnet.princeton.edu