A “smoking gun” is decisive evidence or information that establishes responsibility or culpability for an act. Use it when the evidence is presented as strongly establishing responsibility; ordinary clues or weak suspicion do not automatically amount to a smoking gun.
ReviewedEvidence1 sourceSectionPhrases & Idioms
Quick answer
A “smoking gun” is decisive evidence or information that establishes responsibility or culpability for an act.
Key details
Canonical Formsmoking gun
Core Meaninginformation or evidence that proves responsibility or culpability
Further guidance
History Boundary
Current meaning is published without asserting unsupported inventor, coinage date, or absolute-first-use chronology.
Meaning
information or evidence that proves responsibility or culpability
Usage Boundary
Use it when the evidence is presented as strongly establishing responsibility; ordinary clues or weak suspicion do not automatically amount to a smoking gun.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
“Caught red-handed” means discovered in the act of doing something wrong or illegal. The expression is stronger than saying someone is merely suspected, because it centers on being found during the wrongdoing.
“Tip of the Iceberg” means a small visible or known part of something much larger, often a problem. This guide focuses on current documented usage and does not assert unsupported origin chronology.
“Under your nose” can describe something in an obvious nearby place and can also emphasize that something happened openly without being noticed or prevented. This guide keeps those current senses separate from origin speculation.
“A dime a dozen” is a chiefly US idiom for something very common, easy to find, and not especially distinctive. The wording can carry a dismissive tone when it suggests that something is readily replaceable.
“A drop in the bucket” describes an amount that is very small compared with what is needed or compared with a much larger whole. Cambridge labels it as the US form and gives “a drop in the ocean” as the UK counterpart.
“A leopard can’t change its spots” is a saying about the persistence of character, especially negative traits. Cambridge also records the “doesn’t change its spots” form. This guide limits the page to present-day form and meaning rather than asserting an unsupported exact origin date.
“A Needle in a Haystack” means something that is extremely difficult or effectively impossible to find because the search area is so large. This guide focuses on the documented modern idiomatic meaning and does not claim an unsupported exact origin date.
