be on thin ice

be (skating/walking) on thin ice

to be taking a big risk They knew that by publishing the article they were skating on thin ice.

Name	Pronounced	Usage
Adolphus	-	Ancient Germanic (Latinized)
Mahvash	-	Persian
Kostya	-	Russian
Asco	-	Ancient Germanic
Kenshin	ken-sheen	Japanese
Josefa	ho-SE-fah (Spanish)	Spanish, Portuguese, Czech