Meaning
Completely confused, disoriented, or at a loss over what to do next. Mainly British; American English more often uses the shorter form 'at sea' for the same feeling. It usually describes someone genuinely overwhelmed by an unfamiliar situation rather than mildly puzzled. Informal and mainly British, with a sympathetic rather than mocking tone toward the confused person. Regional use: British English.
Origin
The expression extends the older nautical phrase 'at sea': before reliable navigation, a ship out of sight of land could not be sure of its position, so being 'at sea' came to mean being lost or uncertain. The Phrase Finder records the figurative shorter form in Sir William Blackstone's Commentaries on the Laws of England (1768), where a court of equity is described as 'still at sea', and traces the earliest known print of the full form to Frederick C. Selous's Travel and Adventure in South-East Africa (1893). Collins marks the idiom as British, listing 'at sea' as the equivalent short form and noting its frequency in journalism.
Research Sources
References used to check this entry’s meaning, history, or documented forms.
Variants
- at sea
- be all at sea
- be all at sea over something
- feel all at sea
Usage Examples
- Without her usual briefing pack, the stand-in presenter was all at sea within the first ten minutes.
- I have read the visa guidance twice and I am still all at sea.
- The new recruits looked all at sea until a sergeant walked them through the radio drill.