Exchange Blows is a term used to describe a physical altercation between two people. It is often used in boxing, where two opponents will exchange punches in an attempt to knock out the other. The term can also be used to describe any physical altercation, such as a fight or a wrestling match. In a crossword puzzle, the term Exchange Blows can be represented by the solutions BOX (3 letters) and SPAR (4 letters). BOX is a reference to the boxing ring, while SPAR is a reference to sparring, which is a type of practice boxing.