## Etymology
A clipping of various words beginning with sub-, chiefly substitute, submarine, and subscription, ultimately from Latin sub ('under, beneath, close to').

## AI Etymology
Sub is a clipping of various words beginning with sub-, chiefly substitute, submarine, and subscription, ultimately from Latin sub ('under, beneath, close to'). Its shape is shortened by clipping, which explains why the modern form is briefer than the older words behind it. As a noun and verb, it denotes "a substitute, submarine, or subscription; or to act as a substitute", keeping the historical idea close to its dictionary sense. Relevant historical forms include Latin sub. Related words include substitute, submarine, subscription.

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