1. (

• unblock ,

) clear or remove an obstruction from; "the procedure unblocked his arteries" ;

2. (

• unblock

) 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 ;

3. (

• unblock ,
• unfreeze ,
• free ,
• release

) make (assets) available; "release the holdings in the dictator's bank account" ;