Meaning

verb crowd or pack to capacity

verb put something somewhere so that the space is completely filled

verb study intensively, as before an exam

originFrom Middle English crammen, from Old English crammian (“to cram; stuff”), from Proto-West Germanic *krammōn, from Proto-Germanic *krammōną, a secondary verb derived from *krimmaną (“to stuff”), from Proto-Indo-European *ger- (“to assemble; collect; gather”). Compare Old English crimman (“to cram; stuff; insert; press; bruise”), Icelandic kremja (“to squeeze; crush; bruise”).

Etymology from Wiktionary, CC BY-SA 3.0