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Undercross

//ˈʌndərˌkrɒs// noun

Noun

1
A passage or underpass where a roadway, railway, or infrastructure crosses under another.
"The whole of the undercross is perfect, excepting the bases of the outer columns, and forms a fine superstructure of gigantic support to the light and delicate parts above."
2
The strand or segment in a knot diagram that passes beneath another at a crossing; i.e., the under‑crossing strand in a knot projection. As distinguished from the overcrossing or over‑strand in knot projections
"If we arrive at an undercross, then we move the branch of the overcross over the rest of the knot up to the end of K."

From under- + cross.

Unscramble this word: undercross