Outgrow vs Overestimate - What's the difference?

As verbs the difference between outgrow and overestimate

is that outgrow is to become too big or mature for some purpose while overestimate is to judge too highly.

To become too big or mature for some purpose.

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

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

To grow faster or taller than something or someone else.

''The best adapted plant varieties tend to outgrow the other.

* outgrowth

(en-verb)

to judge too highly

Experts overestimate the level of harm of cigarettes.

* (to judge too highly) underestimate