From Longman Dictionary of Contemporary Englishplough something ↔ up phrasal verbBREAKto break up the surface of the ground by travelling over it many times Horses plough up the paths and make them muddy for walkers. → plough→ See Verb table
Examples from the Corpus
plough up• Duwayne ploughs stolidly up and down the length of the pool several times like a great slab of walrus.• Some one will plough it up and lose a leg. 