grind (something) to (something)
To pulverize something into a particular state. My daughter has a hard time swallowing pills, so I grind her antihistamine tablets to a fine powder and put them in her yogurt.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
grind something to something
to keep grinding something until it is something. I ground the fennel seeds to a powder and threw them in the simmering sauce. The wheels of the cars, trucks, and buses had ground the football to a broken mass.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.