What is the meaning of come down?

verb

• Move downward and lower, but not necessarily all the way.
  • usage: "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"
  • synonyms: descend, fall, go down
• Be the essential element.
  • usage: "The proposal boils down to a compromise"
  • synonyms: reduce, boil down
• Fall from clouds.
  • usage: "rain, snow and sleet were falling"; "Vesuvius precipitated its fiery, destructive rage on Herculaneum"
  • synonyms: precipitate, fall
• Get sick.
  • usage: "She fell sick last Friday, and now she is in the hospital"
  • synonyms: sicken
• Criticize or reprimand harshly.
  • usage: "The critics came down hard on the new play"