drill

regimen

custom, fashion, habit, practice (also practise), trick, wont

approach, manner, method, procedure, strategy, style, tack, technique, way

assignment, homework, lesson

brushup, refresher, review

broach, tap

poke, prick, prickle

penetrate

burrow (into), excavate, gouge, groove, hollow

break, cut, gash, notch, rend, rupture, slash, slit, split

blow away, bring down, drop, pick off, shoot down

blaze, pepper, potshot, snipe (at)

blast (at), fire (at)

pistol, shotgun

machine-gun, tommy-gun