archaic past tense of 'edgrow' (to increase or grow), a very rarely used or obsolete verb form.
From Old English roots 'ed-' (a prefix) and 'grow', with irregular past tense formation similar to archaic patterns; this form is virtually extinct in modern English.
English verbs used to have dozens of irregular forms (like 'go/went/gone'), but we've been simplifying them for centuries—'edgrew' lost the battle and disappeared, replaced by 'grew'.
Complete word intelligence in one call. Free tier — 50 lookups/day.