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under the hood
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[hot-rodder talk] 1. 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."