The OED entry[1] for forget (v.), under sense 1(b), has citations going back a couple centuries: > b. To fail to recall to mind; not to recollect. > 1787 ‘G

The OED entry[1] for forget (v.), under sense 1(b), has citations going back a couple centuries: > b. To fail to recall to mind; not to recollect. > 1787 ‘G. Gambado’ Acad. Horsemen 12 He says much the same of rabbits and onions, but I forget how he brings that to bear. > 1847 F. Marryat Children of New Forest II. i. 3 I forget the sign [of the inn]. [1] https://www.oed.com/view/Entry/73319 https://www.oed.com/view/Entry/73319