Sharp knocks is a term used to describe a sound made by a hard object hitting a surface. The crossword solutions for this term are RAPS (4 letters), ZINGS (5 letters), and RATATAT (7 letters). Raps is a sound made by a hard object hitting a surface quickly and repeatedly. Zings is a sound made by a hard object hitting a surface with a high-pitched noise. Ratatat is a sound made by a hard object hitting a surface rapidly and continuously.