hunt down
hunt somebody ⇔ down
to search for somebody until you catch or find them, especially in order to punish or harm them
The President warned that terrorists would be hunted down.
hunt something ⇔ down/out
to search for something until you find it
We hunted down their phone number and gave them a call.
I hunted out my old school photos to show Mary.
e.g.
So, What? Are they going to hunt down every single one of us, one by one? それで…？俺たち囚人をひとりずつ狩ろうってか (/yupeco/『ゴールデンカムイ』4話)