Verb weigh down has 2 senses
  1. weigh down, weigh on - be oppressive or disheartening to
    --1 is one way to sadden
    Antonyms: lighten, buoy up
    Sample sentence:
    The bad news will weigh down him
  2. drag down, bear down, bear down on, press down on, weigh down - exert a force with a heavy weight; "The snow bore down on the roof"
    --2 is one way to press
    Sample sentence:
    Something ----s something
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