胸底

きょうてい【胸底】

one's heart (of hearts); one's innermost [inmost] heart; the bottom of one's heart.

●胸底深く deep (down) in one's heart.

●胸底に秘める hug [keep] 《a secret》 to one's bosom.

●胸底を打ち明ける open one's heart 《to…》; unbosom oneself 《to…》.