Meaning of “at sea” in the English Dictionary

british dictionary

"at sea" in British English

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at sea

confused:

I'm all/completely at sea with the new computer system.

(Definition of “at sea” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"at sea" in American English

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at sea

confused:

With no data they could depend on, they were completely at sea.

(Definition of “at sea” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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