1. Eating fat and thin: a metaphor for taking advantage of things.

2. Monks eat in all directions: a metaphor for reaching out everywhere to take advantage.

3. occasionally change the gap: I am still opportunistic. Seek personal gain by improper means. It also refers to using cleverness.

4. Lost his wife and soldiers: compensation: loss; Discount: loss. Metaphor wants to take advantage, but both lose.

5. Eating pro-wealth and being black: It shows that people are greedy and selfish, and love to take advantage.

6. Break your word and get fat: break your word: break your promise. Break a promise, just to take advantage of yourself.

7. stealing chickens and not eating rice: a proverb. Instead of stealing chickens, it lost a handful of rice. Metaphor takes advantage, but suffers.

8. opportunism: refers to seeking personal gain by improper means. It also refers to using cleverness.

9. Goose plucking: Goose can pluck when flying over. Originally described as superb martial arts, it was later compared to a person who likes to take advantage. When they see the benefits, they must seize the opportunity to make a profit.

All these idioms can be used to describe people who are greedy for petty gain, but they need to be chosen according to the context and object.