verb (v)

• release or vent(verb.contact)

  Example:
  Unleash one's anger.
  

  source: wordnet30
• release from a leash(verb.contact)

  Example:
  Unleash the dogs in the park.
  

  source: wordnet30
• turn loose or free from restraint(verb.contact)

  Synonym:
  let loose, loose
  

  source: wordnet30
• To free from a leash, or as from a leash; to let go; to release; as, to unleash dogs.(verb)

  source: webster1913