WordNet (r) 3.0 (2006):

come down
    v 1: move downward and lower, but not necessarily all the way;
         "The temperature is going down"; "The barometer is
         falling"; "The curtain fell on the diva"; "Her hand went up
         and then fell again" [syn: descend, fall, go down,
         come down] [ant: arise, ascend, come up, go up,
         lift, move up, rise, uprise]
    2: be the essential element; "The proposal boils down to a
       compromise" [syn: reduce, come down, boil down]
    3: fall from clouds; "rain, snow and sleet were falling";
       "Vesuvius precipitated its fiery, destructive rage on
       Herculaneum" [syn: precipitate, come down, fall]
    4: get sick; "She fell sick last Friday, and now she is in the
       hospital" [syn: sicken, come down]
    5: criticize or reprimand harshly; "The critics came down hard
       on the new play"

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "come down":
   alight, be found, be met with, be realized, befall, betide,
   cascade, cataract, collapse, come, come about, come in, come off,
   come to pass, come true, crash, crash-land, decline, degenerate,
   descend, deteriorate, dip down, ditch, down, downwind, drop,
   drop down, drop off, eventuate, fall, fall down, fall off, go down,
   go downhill, go off, go to pot, gravitate, hap, happen,
   have a comedown, hit rock bottom, land, level off, light,
   lose altitude, occur, overshoot, pancake, parachute, pass,
   pass off, pitch, plummet, plunge, pounce, pour down, precipitate,
   rain, reach the depths, settle down, sink, slip, stoop, swoop,
   take place, talk down, touch bottom, touch down, transpire,
   trend downward, upwind