bedrock (noun)
The solid rock that lies underneath soil or loose earth. Metaphorically, it refers to the fundamental principles or facts upon which something is based.
"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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