Refers to solid rock underlying surface materials, used in geology, construction, and figuratively for a firm foundation.
この地域の岩盤は非常に硬い。
The bedrock in this area is very hard.
Before constructing the building, we surveyed the depth of the bedrock.
The construction work reached the bedrock deep underground.
They cut into the bedrock to dig the tunnel.
The bedrock collapsed in the earthquake, blocking the road.
The building stands on solid bedrock.