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Idiom is correct.
Any idiom can be correct. The trick is to learn which one means what!
This is not an idiom. When you see AS ___ AS ___ you have A Simile. The correct simile is "on the tip of his tongue."
This is NOT an idiom -- when you hear AS __ AS __ you have A Simile. The correct simile would be "we're all in the same boat," meaning "we have the same circumstances for everyone."
The phrase "Always go in search for the correct idiom" is #39 on a list called "The Bestest Guide to Gooder English". The idiom in the sentence is "go in search for" and it's not incorrect,really, but just kind of strange. "Use appropriate idioms" or "If you're going to use an idiom, make sure it's appropriate" would be better, I imagine.The one on that list I haven't figured out is #40, "3D96#" Anybody know that one?
The correct idiom is "a frog in my throat," meaning that your voice is hoarse and croaking.
As an idiom yes.
the runaround
"For free' is grammatically correct. It is an idiom of the English language.
This is not an idiom. It means exactly what it says in grammatically-correct fashion.
It's not an idiom. AS ___ AS___ would be A Simile ... the correct simile would be as cool as a cucumber.
An idiom is an expression, the meaning of which is dependent on cultural context and social understanding. The meaning of the idiom is not predictable based on its constituent elements, but is merely an expression. An example of an idiom is "kicked the bucket". These words are not taken as literal, but as an idiomatic expression.