blow up in your face
blow up in (one's) face
To have a plan go wrong or awry. Mike was trying to sabotage my campaign, but the plan blew up in his face when I overhead him talking about it. Tina's decision to invest only in technology stocks has really blown up in her face.
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blow up in your faceor
explode in your face
COMMON If a situation blows up in your face or explodes in your face, it has a bad result that you did not expect. His outburst yesterday could blow up in his face. Those that have supported his cause will certainly question his motives. The scandal has exploded in the government's face.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
blow up in your face(of an action, plan, or situation) go drastically wrong with damaging effects to yourself.
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