blow up in face
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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.
blow up in someone's face
1. Lit. to blow up or explode suddenly. The bomb blew up in the terrorist's face. The firecracker blew up in his face and injured him.
2. Fig. [for something] to get ruined while someone is working on it. All my plans blew up in my face. It is terrible for your life to get ruined and blow up in your face.