The term 'block head' can be defined by two crossword solutions: auctioneer (10 letters) and ASS (3 letters). An auctioneer is a person who conducts an auction, which is a process of buying and selling goods or services by offering them up for bid, taking bids, and then selling the item to the highest bidder. An ASS is a donkey, which is a domesticated member of the horse family that is used as a working animal, especially for carrying loads. Therefore, the term 'block head' can be interpreted as someone who is stubborn and unyielding, like a donkey.