Shoot oneself in the foot
Meaning
Do something self-defeating.
Usage
Used when a mistake causes self-inflicted problems.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Literal accident harming one's own ability to fight.
Military contexts from the firearm era warn about such accidents.