Usage Note
béton refers to the building material (concrete). The colloquial adjective béton (invariable) means 'rock-solid' or 'watertight': un alibi en béton (an airtight alibi). Béton armé (reinforced concrete) is a key term in construction. The verb bétonner means both to concrete over and, figuratively, to make something airtight.
Examples
"Le mur est construit en béton."
Natural Translation
The wall is built in concrete.
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