v. i. To grow to an inferior, or less than the usual, size or height. Wyclif. [ 1913 Webster ]
a. Undergrown. [ Obs. ] Chaucer. [ 1913 Webster ]
a. Of small stature; not grown to a full height or size. [ 1913 Webster ]
n. That which grows under trees; specifically, shrubs or small trees growing among large trees. Milton. [ 1913 Webster ]