Verb

1. To become too big or mature for some purpose.

   Poor boys often have to wear whatever a big brother has outgrown.

2. To leave some object, habit, belief ... behind, no longer need or use it, as one grows.

   After protesting he outgrew bare-butt spankings with dad's hairbrush, Bo now gets it with the razor-strop

3. To grow faster or taller than something or someone else.

   The best adapted plant varieties tend to outgrow the other.