What is Blessing ?
Blessing is (noun) 1. a prayer which blesses people or things The priest gave his blessing to the congregation. 2. to give your blessing to something to approve something officially The chairman gave his blessing to the new design. 3. something which brings happiness She enjoyed the blessings of good health and a happy family. it was a blessing in disguise it was a good thing, even if at first it seemed bad Breaking his leg was a blessing in disguise it meant he could spend more time studying. it’s a mixed blessing it has both advantages and disadvantages Automation can be a mixed blessing machines usually tend to be out of order when you need them most.
source: Easier English, Student Dictionary Upper Intermediate Level