bring down

1.  Cause to fall, collapse, or die. For example, The pilot won a medal for bringing down enemy aircraft, or The bill's defeat was sure to bring down the party. [c. 1300]
2.  Cause a punishment or judgment, as in The bomb threats brought down the public's wrath on the terrorists [Mid-1600s]
3.  Reduce, lower, as in I won't buy it till they bring down the price, or He refused to bring himself down to their level. This usage may be literal, as in the first example, or figurative, as in the second. [First half of 1500s]

Definition: reduce or hurt
Antonyms: aid, encourage, help, raise

The verb has 6 meanings:

Meaning #1: move something or somebody to a lower position
  Synonyms: lower, take down, let down, get down

Meaning #2: cause the downfall of; of rulers
  Synonyms: overthrow, subvert, overturn

Meaning #3: impose something unpleasant
  Synonyms: inflict, visit, impose

Meaning #4: cause to come to the ground; of aircraft
  Synonyms: land, put down

Meaning #5: cause to be enthusiastic

Meaning #6: cut down on; make a reduction in
  Synonyms: reduce, cut down, cut back, trim, trim down, trim back, cut