Select the most appropriate meaning of the given idiom.

At sea

At a loss or perplexed

The most appropriate meaning of the idiom "at sea" is at a loss or perplexed.

The idiom comes from the idea of being lost or confused on the open ocean. It is often used to describe someone who is feeling overwhelmed or unsure of what to do

The other options are not correct.

• To overcome: This is not the same as at sea. To overcome means to succeed in dealing with a problem or difficulty.
• Obsolete: This is not the same as at sea. Obsolete means no longer in use or fashionable.
• To blunder: This is not the same as at sea. To blunder means to make a clumsy or foolish mistake.