Also means
thread (of a screw)
Usage Note
Rosca covers a wide range of ring-shaped objects: a bread roll or pastry ring, the thread of a bolt or screw (rosca de tornillo), or an inflatable ring. The idiomatic phrase no comerse una rosca (literally 'not to eat a single roll') means to have no success at all, especially romantically, in colloquial Spanish.
Examples
"Compramos una rosca de Reyes para celebrar."
Natural Translation
We bought a Three Kings bread ring to celebrate.

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