go underground

in. to go into hiding; to begin to operate in secret. The entire operation went underground, and we heard no more about it.

Name	Pronounced	Usage
ÜLkÜ	-	Turkish
Ragnhildur	-	Icelandic
Jurian	-	Medieval Low German
Darion	DER-ee-ən, DAR-ee-ən	English (Modern)
Faustina	[fɔ:'sti:nə]
Arbuckle	[a:'bʌkl]