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This is not an idiom. When you see AS ___ AS ___ you are looking at A Simile. This is comparing two flat things.
A simile.
simile
the sea was still nothing was moving no one was around
A metaphor
As quick as a wink is a simile. ----
It is a simile.
simile It is an example of a simile (uses like or as). A simile in itself though is a type of metaphor.
simile
simile
that man
It is a similie as you are comparing (something) to how sly the fox is. A similie uses the words "like or "as".