overˈwhelmer [f. as prec. + -er1.] One who or that which overwhelms. 1513Douglas æneis xii. ix. 108 Fers Achilles..That was ourquhelmar of king Pryamus ring [= kingdom].1807A. Seward Lett. (1811) VI. 357 It is not in the power of that universal overwhelmer [time] to push him from my memory.