Shoot yourself in the foot
Meaning
Harm yourself through your own actions.
Usage
Used when mistakes hurt one's own standing.
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 mishap while handling firearms.
Common in military and sports talk from the 20th century.