Definition of "go underground"

go underground

verb
third-person singular simple present goes underground, present participle going underground, simple past went underground, past participle gone underground
1. (intransitive, especially of an animal, chiefly Canada, US) To escape into a burrow, hole, etc. when being hunted.
2. (figurative, by extension, chiefly Canada, US) To hide from public view or sequester oneself, especially when authorities, members of the news media, or others are looking for one.