skull and crossbones: meaning, definition, pronunciation and examples
C1Informal to Neutral. Often used in historical, safety/technical, or cultural contexts.
Quick answer
What does “skull and crossbones” mean?
A symbol consisting of a human skull above two crossed bones, widely recognized as a sign of danger or death.
Audio
Pronunciation
Definition
Meaning and Definition
A symbol consisting of a human skull above two crossed bones, widely recognized as a sign of danger or death.
Used as a warning or identifier for toxic, poisonous, or otherwise deadly substances; historically associated with pirates, used on their flags (the Jolly Roger); also symbolizes rebellion, danger, or a macabre aesthetic.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Spelling is consistent ('crossbones' as one word). Usage frequency and cultural associations are nearly identical.
Connotations
In both varieties, primary connotations are danger/death (warning label) and piracy. The pirate association is more playful or historical, while the warning label connotation is serious.
Frequency
Equally common in both dialects. Slightly more frequent in British media discussing historical piracy due to the UK's naval history.
Grammar
How to Use “skull and crossbones” in a Sentence
The [container/flag/sign] bore a skull and crossbones.They marked it with a skull and crossbones.The skull and crossbones is a universal symbol for [danger/poison/pirates].Vocabulary
Collocations
Examples
Examples of “skull and crossbones” in a Sentence
verb
British English
- The protesters threatened to skull-and-crossbones the council's official documents. (very rare, creative use)
adjective
British English
- He wore a skull-and-crossbones patch on his jacket.
American English
- The bottle had a classic skull-and-crossbones label.
Usage
Meaning in Context
Business
Rare. Possibly in branding for edgy products (e.g., energy drinks, clothing) or in regulatory contexts for hazard labeling.
Academic
Used in historical studies (piracy, naval history) and semiotics (study of symbols).
Everyday
Used when discussing warnings on cleaning products, Halloween decorations, pirate-themed media, or tattoos.
Technical
Standard in chemistry, safety protocols, and toxicology for labeling acutely toxic materials (though often superseded by GHS pictograms).
Vocabulary
Synonyms of “skull and crossbones”
Strong
Neutral
Weak
Vocabulary
Antonyms of “skull and crossbones”
Watch out
Common Mistakes When Using “skull and crossbones”
- Using it as a plural without 'a' (e.g., 'Skull and crossbones were on the flag' is incorrect; use 'A skull and crossbones was on the flag').
- Misspelling as 'skull and cross-bones' (though hyphenated form 'skull-and-crossbones' as a modifier is acceptable).
FAQ
Frequently Asked Questions
Very nearly. The Jolly Roger is the pirate flag, which most famously features a skull and crossbones. However, other pirate flag designs also existed, so 'Jolly Roger' can refer to flags with different symbols, while 'skull and crossbones' specifies the most common design.
Its official use has declined. Modern international hazard communication systems (like GHS) use specific pictograms, such as the 'skull and crossbones' for acute toxicity (GHS06). So a stylized version is still used, but often within a diamond-shaped border.
Yes, commonly in a hyphenated form: 'skull-and-crossbones'. For example: 'a skull-and-crossbones tattoo', 'skull-and-crossbones imagery'.
It is primarily a compound noun (a noun phrase). It functions as a singular unit, e.g., 'A skull and crossbones was painted on the door.'
A symbol consisting of a human skull above two crossed bones, widely recognized as a sign of danger or death.
Skull and crossbones is usually informal to neutral. often used in historical, safety/technical, or cultural contexts. in register.
Skull and crossbones: in British English it is pronounced /ˌskʌl ən ˈkrɒs.bəʊnz/, and in American English it is pronounced /ˌskʌl ən ˈkrɔːs.boʊnz/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “Fly the skull and crossbones (to act rebelliously or declare oneself an outlaw).”
Learning
Memory Aids
Mnemonic
Imagine a pirate SKULL laughing as he CROSSes his BONES, warning you of danger.
Conceptual Metaphor
DANGER IS A PIRATE / DEATH IS A SYMBOL.
Practice
Quiz
In which of these contexts would the phrase 'skull and crossbones' be LEAST appropriate?