First, homophonic. Such as: an empty coffin buried-arrogant (wood); This kind of two-part allegorical saying is homophonic with homophones or near homophones, which leads to another meaning from the original meaning. Seeing this kind of two-part allegorical saying, it often takes several turns to suddenly realize, which is more interesting. Some books classify it as a pun, which makes sense.
Second, metaphor. Such as: moving wood in the alley-straight; Cold water instant noodles-not much progress; This kind of two-part allegorical saying is an analogy to objective or imaginary things. If we understand the characteristics and circumstances of the contrast ratio, we can naturally understand the "mystery" in the second half.
Third, metaphor. Such as: cattle shoulders and feet-irresponsible; Chess in the chessboard-you can only enter and not retreat; This kind of two-part allegorical saying is to use some or some objects and animals as examples. If you understand the essence of Bushby, you can understand its meaning.
Fourth, the story. Such as: Liu Bei borrowed Jingzhou-only borrowed but not returned; Lin Chong threatened Hong-just to see your flaw;
This kind of xiehouyu generally refers to common allusions, fables, myths and legends. As long as you know the story of Liu Bei and Lin Chong, you can know it clearly. In the case of cross-category, it is classified as a category with more obvious characteristics. Such as: paper pipa-talking (playing) is not allowed. This kind of two-part allegorical saying is both metaphor and homophonic, and now it is classified as homophonic.