hunt down
phrasal verbhunt somebody down
to search for somebody until you catch or find them, especially in order to punish or harm them 追捕，缉捕（某人） The President warned that terrorists would be hunted down. 总统警告说恐怖分子将被追捕。
hunt something down/out
to search for something until you find it 搜寻，寻找（某物） We hunted down their phone number and gave them a call. 我们找到了他们的电话号码，给他们打了个电话。 I hunted out my old school photos to show Mary. 我找出我以前在学校的照片给玛丽看。