情字绕口青丝绕手
[qíng zì răo kŏu qīng sī răo shŏu]
The phrase '情字绕口青丝绕手' poetically links the difficulty in talking about emotions (emotions getting 'tied up' in one's mouth) with physical love, symbolized by hair intertwining with fingers. This expresses the entanglement of deep feelings which cannot easily be untangled.