burn (one's) bridges in front of (one)
To do something that is likely to cause problems later. That kid isn't bullying you, so if you tattle on him to the teacher, you're definitely burning your bridge in front of you. Dude, you're burning your bridges in front of you by talking back to Mom and Dad like that when you need them to lend you the car on Friday night. I know, you told me I'd be burning my bridges in front of me if I cheated on my test, but I didn't listen.
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