before 900;for- + get; replacing Middle Englishforyeten,Old Englishforg(i)etan; cognate with Old Saxonfargetan,Old High Germanfirgezzan
Both forgot and forgotten are used as the past participle of forget: Many have already forgot (or forgotten) the hard times of the Depression. Only forgotten is used attributively: half-forgotten memories.
O.E. forgytan, from for- "passing by, letting go" (cf. forbear, forgo) + gietan "to grasp" (see get). A common Gmc. construction (cf. O.S. fargetan, Du. vergeten, Ger. vergessen "to forget"). The literal sense would be "to lose (one's) grip on," but that is not recorded in any Germanic language. Related: Forgetting; forgot; forgotten.