Chinese

		people's thoughts	to separate; to stand or lie between; to divide to separate; to stand or lie between; to divide; to cut off	tummy; belly
simp. and trad. (人心隔肚皮)		人心	隔	肚皮

Idiom

人心隔肚皮

1. keep one's thoughts to oneself
2. keep one's thoughts close to one's breast
3. to not reveal what one is thinking