Interpretation and analysis: first of all, because a household name means that every household understands it; As we all know, the shouts of collecting junk are very loud. People who collect junk tell people in the house by shouting loudly, so people who need to sell junk will know that the waste is coming when they hear this shouting, which is in line with the meaning of household names.

This two-part allegorical saying is a kind of logical reasoning, and the explanation part is the result of reasoning from the previous metaphor part. Similarly:

Narcissus doesn't bloom-play dumb.

Dumb people eat coptis chinensis-they can't tell you what's bitter.

All rivers run into the sea-the general trend

Scorpions and tigers lift the curtains-hold out their little hands

Extended data:

There is also a homophonic two-part allegorical saying, which adds homophonic elements to the former type. For example:

1, nostril filling rice soup-that's enough.

2. Fried Shrimp-Red Man (Ren)

3, chicken feathers-courage (duster)

4, winter melon skin to make scorpions-indisputable (steamed)

5, bean sprouts fried shrimp (shrimp)-two worthless (straight)