This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To remove or clear an obstruction from: unblock a road; unblock an artery.

v. To remove or clear a block or obstruction from.

v. To free or make available.

In whist, to play an unnecessarily high card, in order to avoid interrupting a partner's long suit.

v. make (assets) available

v. 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

v. clear or remove an obstruction from

"It is " our hope, " the official also said, that talks that could see defense electronics company Thales SA modernize an Indian fleet of Mirage fighter jets will " unblock " during Mr. Sarkozy ' s visit."

unblocked    unblocking    unblocks   

issue    supply    play    loosen up    unstuff