verb (v)

• make loose or looser(verb.change)

  Example:
  Loosen the tension on a rope.
  

  Synonym:
  loose
  

  source: wordnet30
• make less severe or strict(verb.social)

  Synonym:
  relax
  

  source: wordnet30
• become less severe or strict(verb.social)

  source: wordnet30
• disentangle and raise the fibers of(verb.contact)

  Synonym:
  tease, tease apart
  

  source: wordnet30
• cause to become loose(verb.contact)

  Example:
  Loosen the necktie.
  

  Synonym:
  undo, untie
  

  source: wordnet30
• make less dense(verb.contact)

  Example:
  Loosen the soil.
  

  source: wordnet30
• become loose or looser or less tight(verb.change)

  Example:
  The noose loosened.
  

  Synonym:
  loose, relax
  Antonym:
  stiffen
  

  source: wordnet30
• To make loose; to free from tightness, tension, firmness, or fixedness; to make less dense or compact; as, to loosen a string, or a knot; to loosen a rock in the earth.(verb)

  source: webster1913
• To become loose; to become less tight, firm, or compact.(verb)

  source: webster1913