under the hood
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under the hood: adj.

  [hot-rodder talk]

  1. Used to introduce the underlying implementation of a product (hardware, software, or idea). Implies that the implementation is not intuitively obvious from the appearance, but the speaker is about to enable the listener to grok it. “Let's now look under the hood to see how ....”

  2. Can also imply that the implementation is much simpler than the appearance would indicate: “Under the hood, we are just fork/execing the shell.”

  3. Inside a chassis, as in “Under the hood, this baby has a 40MHz 68030!”

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