Be skating/walking on thin ice negative informal
"Walk" , "tred", or "stand" can be used instead of "skate" without changing the meaning. Besides that, you can also use only phrase "on thin ice" with the same meaning
You shouldn't have engaged in the scuffle. You're walking on thin ice.
He's skating on thin ice when his company is on the verge of bankruptcy.
If your mother know you steal her money, you're skating on thin ice.
The verb "be" should be conjugated according to its tense.
This idiom comes from Holland where skating was very well known and they were early colonizers in North America. "Skating on thin ice" is a common sense phrase making use of the verb. There was no doubt about the risk of skating on thin ice. Therefore, children were warned not to do that in Holland and all other countries where skating was popular. Metaphoric usage probably followed shortly thereafter.
1.Someone viewed with contempt
2. Very bad
1. He dropped out of college and became a crumb bum.
2. The food here is crumb bum! I will never come back to this restaurant once again.