(idiomatic) To become too physically large for something, especially clothes.
I give my old clothes to charity when I've grown out of them.
(idiomatic, by extension) To become too mature for something.
Grow-out-of Sentence Examples
Of Phanerogams, only the Dryas octopetala covers small areas of the debris, interspersed with isolated Cochlearia, &c., and, where a layer of thinner clay has been deposited in sheltered places, the surface is covered with saxifrages, &c.; and a carpet of mosses allows the arctic willow (Salix polaris) to develop. Where a thin sheet of humus, fertilized by lemmings, has accumulated, a few flowering plants appear, but even so their brilliant flowers spring direct from the soil, concealing the developed leaflets, while their horizontally spread roots grow out of proportion; only the Salix lanata rises to 7 or 8 in., sending out roots I in.
They grow out of the influence of Ambrose of Milan, but far more of Augustine of Hippo; and behind the latter to no small degree there is the greater influence of St Paul.
As the varying phenomena presented by the moon grow out of its orbital motion, the general character of the latter will be set forth in advance.
Impressed, Dusty wondered if Darian was beginning to grow out of his insolent teenager stage.
Ariel as Ceres takes center stage, appearing to grow out of the earth itself and graced by the arrival of a passing cornfield.