bone, con, contemplate, dig, drill, drudge, elucubrate, examine, fag, go over, grind, grub, hammer, hammer away, lucubrate, moil, peg, peg away, peruse, plod, plug, plug along, plug away, plunge into, pore over, pound away, practice, read, regard studiously, restudy, review, slog, study, swot, toil, travail, vet, work away