话中有话 Between the lines
Explanation
话中有话是指言语中暗含着其他意思，需要用心体会。
It means that words have other meanings hidden inside and need to be carefully considered.
Origin Story
话说贾府抄家之后，家道中落，贾母去世，家人们为丧事操办发愁。王熙凤身患疾病，仍操持家务。丫鬟鸳鸯坚持要风光大葬，邢夫人等人听出话中有话，暗指王熙凤不应过度操劳，免得留下隐患。她们表面上关心王熙凤，实际上是不想让王熙凤插手丧事，既减轻了王熙凤的负担，也暗中保护了她。
After the Jia family's assets were confiscated, their family was in decline. When the Grandmother Jia passed away, the family members worried about managing the funeral. Although Wang Xifeng was sick, she was still in charge of household affairs. The maid, Yuanyang, insisted on a grand funeral so that the old lady would go away gloriously. Xing Fu Ren and others sensed something hidden between the words and implicitly suggested that Wang Xifeng should not overwork to avoid future problems. On the surface, they cared for Wang Xifeng, but in reality, they did not want Wang Xifeng to get involved in funeral affairs, thus reducing Wang Xifeng's burden and secretly protecting her.
Usage
用于形容说话含蓄，意思不在表面，需要仔细领会。
Used to describe implicit speech where the meaning is not on the surface and needs careful understanding.
Examples
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他的话里话中有话，我一时没听明白。
tade huàli huà zhōng yǒu huà, wǒ yīshí méi tīng míngbai
His words were loaded, I didn't understand them at once.
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领导的话中有话，暗示我们要加班。
lingdǎo de huà zhōng yǒu huà, ànshì wǒmen yào jiā bān
The boss's words suggested that we have to work overtime.