Be all at sea adjective phrase
The word "all" can be omitted.
Be confused about what to do
When my parents passed away since the accident, I was all at sea.
She felt all at sea about her career after graduating from university.
The literal meaning of this phrase is to sail on the sea in a boat, ship or cruise.
The ship is at sea while the storm is blowing up.
Being so scared, confused, and astonished that you can't think or do anything.
To be unable to think clearly and correctly
Unsure or confused.
Not able to focus on something or feel confused because of being shocked or surprised
To cause someone to feel confused, worried, or upset
Any ship that was out of sight of land was in an uncertain position and in danger of becoming lost.
Source: kudelka.com.au
This idiom is an extension of the nautical phrase 'at sea'. It dates from the days of sail when accurate navigational aids weren't available. Any ship that was out of sight of land was in an uncertain position and in danger of becoming lost. 'At sea' has been in use since the 18th century.
If a person has the devil's own luck, he or she has extremely good luck.
A: Yesterday I won a $10 million lottery jackpot and today I won a car in a draw.
B: You have the devil's own luck.