From Longman Dictionary of Contemporary Englishhunt somebody/something ↔ down phrasal verbCATCHto search for a person or animal until you catch them, especially in order to punish or kill them The government agency was created to hunt down war criminals. → hunt→ See Verb table
Examples from the Corpus
hunt down• He controls all hunters, so they will not hunt me down.• How safe would she be in her own flat, if some crazed person was determined to hunt her down?• Would it come through the fields faster than they could run, and hunt them down?• He was warning her that he was going to hunt her down ... and then ... and then ...?• She hunted stereotypes down as if they were sewer rats and stuck radical slogans to the fridge door.• Death hunts him down, in the shape of cancer of the bladder.• They hunted Pedro down like an animal and murdered him in cold blood.• They'd have to hunt us down or suffer a severe loss of credibility. 