what on earth
(where|who|when) on earth

Definition & Meaning of "what on earth"in English

what on earth
01

used to emphasize a question or statement, showing surprise or confusion

Examples
What on earth were you thinking when you decided to climb that tree?
what on earth
Pronunciation
/wˌʌt ˌɑːn ˈɜːθ/
/wˌɒt ˌɒn ˈɜːθ/
what on earth
01

used to express strong surprise, bewilderment, or disbelief at an unexpected situation

what on earth definition and meaning
Euphemistic
Informal

What is the origin of the exclamation "what on earth" and how is it used?

What on earth is an exclamation used to express strong surprise, bewilderment, or disbelief at an unexpected situation. It appeared in English in the 18th century as a polite alternative to expressions invoking God or other strong language, using "earth" to keep the reaction safe and acceptable. People used it in everyday speech, literature, and newspapers to respond to shocking or confusing events. Today it is inoffensive, neutral, and widely understood, often signaling astonishment or incredulity in both casual and formal contexts.

Examples
The door was wide open — what on earth!
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