forgrow verb2 •(no longer used) To become grown over; overgrow; become covered with growth (usually one that is excessive or unsightly).Plutarch saith that mens minds do rust and forgrow through idlenes […] — 1595 •(no longer used) To grow to excess or out of shape; grow unduly.A terror to the new made folke, which neuer erst had knowne So foule a Dragon in their life, so monstrously foregrowne, So great a ground thy poyson paunch did vnderneath thée hide. — 1567 formsforgrew · forgrown · forgrowing · forgrows