
1) Form holes
Found on
https://www.crosswordclues.com/clue/cavitate

cavitate 1. To form bubbles or cavities in a substance. 2. The sudden formation and collapse of low-pressure bubbles in liquids by means of mechanical forces; such as, those resulting from rotation of a marine propeller. 3. The formation of cavities in a body tissue or an organ; especially, those formed in the lung as a result of tuberculosis.
Found on
http://www.wordinfo.info/words/index/info/view_unit/3591/2

Cavities or bubbles form in the fluid low pressure area and collapse in a higher pressure area of the pump, causing noise, damage and a loss of capacity.
Found on
https://www.encyclo.co.uk/local/21120
No exact match found.