skate on thin iceto take a chance, to risk danger or disapproval
[TahlilGaran] Dictionary of Contemporary English ▲
skate on thin ice v. phr. To take a chance; risk danger, disapproval or anger.
You'll be skating on thin ice if you ask Dad to increase your allowance again. John knew he was skating on thin ice, but he could not resist teasing his sister about her boyfriend. [TahlilGaran] English Idioms Dictionary ▲