A resounding blow is a forceful impact that produces a loud sound. The term can be broken down into four crossword solutions: WHACK (5 letters), BANG (4 letters), CLAP (4 letters), and WHANG (5 letters). WHACK is a sharp, sudden blow, while BANG is a loud, explosive sound. CLAP is a sharp, sudden noise made by two objects coming together, and WHANG is a loud, ringing sound. All of these words describe a resounding blow, which is a powerful and loud impact.