verb (v)

• decrease in size, extent, or range(verb.change)

  Synonym:
  decrease, diminish, fall
  Antonym:
  increase
  

  source: wordnet30
• make smaller(verb.change)

  Synonym:
  contract, decrease, minify, reduce, scale down
  

  source: wordnet30
• wear off or die down(verb.change)

  Synonym:
  subside
  

  source: wordnet30
• To make less; to reduce; to make smaller, or fewer; to diminish; to lower; to degrade; as, to lessen a kingdom, or a population; to lessen speed, rank, fortune.(verb)

  source: webster1913
• To become less; to shrink; to contract; to decrease; to be diminished; as, the apparent magnitude of objects lessens as we recede from them; his care, or his wealth, lessened.(verb)

  source: webster1913