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To pulverize or break something into a smaller state or finer substance. A noun or pronoun can be used between "crush" and "up." If I don't crush up the pill and mix it into my daughter's apple sauce, she won't take it.
crush something up (into something)
to press or grind something with great force until it is reduced to something smaller. The chef crushed the almonds up into a powder and sprinkled them on the dessert. The machine crushed up all the glass into tiny bits.