WordNet sense 1 (thwart the passage of):

defeat, vote down, vote out

WordNet sense 2 (drink down entirely):

down, pop, toss off, belt down, bolt down, drink down, pour down

WordNet sense 3 (mark for deletion, rub off, or erase):

obliterate, wipe out

WordNet sense 4 (end or extinguish by forceful means):

stamp out

WordNet sense 5 (the act of terminating a life):

killing, putting to death