作者oversky.

hunt sb/sth down
https://is.gd/H2Rwh1
to search everywhere for someone or something until you find him, her, or it
搜捕，找到

http://www.learnersdictionary.com/d...ion/hunt%20down
hunt (someone) down or hunt down (someone) : to find and capture (someone)

https://ahdictionary.com/word/search.html?q=hunt
To pursue intensively so as to capture or kill: hunted down the escaped convict.

不同的字典，解釋不盡相同。
從沒有惡意的「找到」，到有惡意的「獵殺」都有人用。