From sailors. If you're "at sea," there are no landmarks for you to follow, so you can't tell which way to go.
Another idiom that means the same thing would be "all at sea."
It comes, literally, from assembling all of a ship's crew (all hands) at their mustering point on the ship's deck. This would occur typically in a battle situation. The idiom suggests that all personnel are needed, as for a major undertaking or project.
It is an idiom. It is referring to the large quantity of faces, not literally a sea of heads.
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Right away is not an idiom - it means exactly what it says. Something happens or will happen immediately.
From the sport of wrestling.
A "sea change" is a marked or a profound transformation. To read more about this idiom on Answers.com, see the Related Link.
It's not an idiom. It means exactly what it says. "By all means" or "by any method necessary."
do you mean you think it didnt come from a dairy & veggie farm
I'd say that's more of a true statement rather than an idiom. Prices never DO come down - they always go up.
It's not an idiom - it means just what it says. Something took "no" time to come about. It's an exaggeration, but the meaning is plain.
An idiom is a phrase that cannot be defined literally. Nut is a word, not an idiom. It is a Germanic word.