heart-to-heart talk;words from the bottom of one’s heart ❍ 容妾伸～。(《三国演义》65) May thy handmaid speak from the bottom of her heart?/我已经坚信他这句话完全是出自内心的～。(叶华《幻想和现实》)I was convinced of the sincerity of his words.
肺腑之言
words from the bottom of one’s heart
肺腑之言fèi fǔ zhī yán
肺腑：内心。出自内心的真诚的话。words from the bottom of one’s heart, heart-to-heart talk, speak from the bottom of one’s heart