From Longman Dictionary of Contemporary Englishbe (skating) on thin icebe (skating) on thin iceUPSETto be in a situation in which you are likely to upset someone or cause trouble Don’t be late again, Hugo – you’re skating on thin ice. → ice
Examples from the Corpus
be (skating) on thin ice• You're skating on thin ice, showing up late for work every day.• Legally, the company is on very thin ice with its actions.• He was on thin ice before.• It had been granted grudgingly and she knew she was on thin ice as far as her superiors were concerned.be skating on thin icebe skating on thin iceinformalRISK to be doing something that may get you into trouble → skate 