come down in WordNet English dictionary

1. be the essential element
   "The proposal boils down to a compromise"
   reduce  come down  boil down 
   
2. get sick
   "She fell sick last Friday, and now she is in the hospital"
   sicken  come down 
   
3. criticize or reprimand harshly
   "The critics came down hard on the new play"
   come down 
   
4. 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"
   descend  fall  go down  come down 
   
5. fall from clouds
   "rain, snow and sleet were falling"; "Vesuvius precipitated its fiery, destructive rage on Herculaneum"
   precipitate  come down  fall 
   

come down in English Wiktionary