verb (v)

• clear or remove an obstruction from(verb.contact)

  Example:
  The procedure unblocked his arteries.
  

  source: wordnet30
• play the cards of (a suit) so that the last trick on which a hand can follow suit will be taken by a higher card in the hand of a partner who has the remaining cards of a combined holding(verb.competition)

  source: wordnet30
• make (assets) available(verb.change)

  Synonym:
  free, release, unfreeze
  Antonym:
  block, freeze, immobilise, immobilize
  

  source: wordnet30