noun
the bottom of one's heart; one's innermost feelings
Literary or poetic expression for the deepest part of one's heart or mind. Often used in emotional or reflective contexts.
その言葉は胸底に深く刻まれた。
Those words were deeply engraved in the bottom of my heart.
胸底から湧き上がる悲しみを抑えきれなかった。
I couldn't hold back the sadness welling up from the depths of my heart.