come down

1.  Lose wealth or position, as in After the market crashed, the Tates really came down in the world. A 1382 translation of the Bible by followers of John Wycliffe had this term: "Come down from glory, sit in thirst" (Jeremiah 48:18).
2.  Become reduced in size or amount, be lowered, as in Interest rates will have to come down before the economy recovers. [Mid-1600s]
3.  Be handed down by inheritance, tradition, or a higher authority. For example, This painting has come down to us from our great-grandparents, or These stories have come down through the generations, or An indictment finally came down. [c. 1400]
4.  Also, go down. Happen, occur, as in What's coming down tonight? [Slang; 1960s]

Definition: worsen
Antonyms: boost, improve

The verb has 5 meanings:

Meaning #1: move downward and lower, but not necessarily all the way
  Synonyms: descend, fall, go down

Meaning #2: be the essential element
  Synonyms: reduce, boil down

Meaning #3: fall from clouds
  Synonyms: precipitate, fall

Meaning #4: get sick
  Synonym: sicken

Meaning #5: criticize or reprimand harshly