be at sea

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be at sea

1. To literally sail on the sea in a boat or ship. A: "Is your mother at sea yet?" B: "Yes, her cruise lasts several weeks."
2. To be puzzled, perplexed, or completely confused (about a subject or some task at hand). I tried to do well in this class, but I've been at sea since we started.
See also: sea

be at sea

  (British, American & Australian) also be all at sea (British & Australian)
if someone is at sea, they are completely confused I'm all at sea with this computer manual.
See also: sea