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bedrock (noun)
El lecho rocoso es la roca sólida debajo de la tierra. Metafóricamente, es la base fundamental de algo.
"The construction crew had to drill through ten meters of soil before they reached the bedrock."
Think of a 'bed' made of 'rock'. It is the very bottom layer where the Earth sleeps. It never moves and is the strongest...
Using 'bedrock' to mean 'the very top'. → Using 'keystone' or 'pinnacle'.
Writing it as two words: 'bed rock'. → bedrock
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