1The bottom or lowest part of something — e.g., the bottom of a container, the seabed, or the sole of a shoe; also used figuratively, as in the depths of one's heart.
コップの底に小さな氷が残っている。
There's a small piece of ice left at the bottom of the glass.
靴の底がすり減ってきたので、そろそろ買い替えたい。
The soles of my shoes have worn down, so I'd like to replace them soon.
湖の底には古い遺跡が眠っているかもしれない。
There might be ancient ruins lying on the bottom of the lake.
彼の言葉の底にある本心は見抜けなかった。
I couldn't see through the true feelings underlying his words.