## Etymology
From under- ('beneath') + pass, from Old French passer, from Vulgar Latin *passare, from Latin passus ('step, pace'), from pandere ('to stretch').

## AI Etymology
Underpass is from under- ('beneath') + pass, from Old French passer, from Vulgar Latin *passare, from Latin passus ('step, pace'), from pandere ('to stretch'). Important recorded forms include under (Old English), passus (Latin), and pandere (Latin). Morphologically, the under- element contributes the sense of beneath, lower rank, concealment, or insufficiency, depending on the base it modifies. The modern sense continues the older lexical line without requiring a separate origin. In current use it covers a road or passage running beneath another road or railway. The wider family includes related words such as pass and underpassage.

## Topics
- Transportation

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underpass

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