Derelict means

Original meaning: useless, losing effectiveness. Such as: nonsense, waste, ruins (places that become desolate after being damaged).

Extension: extended meaning "useless things". Such as: repair old items and reuse them. Utilize the "three wastes" ("three wastes", waste gas, waste water, and waste residue).

waste: fèi. The radical "fa" is simplified to "fa". According to ancient calligraphy, strokes are saved and simplified. "Shuowen Jiezi": "Abandoned means that the house has collapsed. From Guang, to make a sound." It is Guangzhou's paradigm to use a factory (a cliff) as a house. Shooting a bow is like stepping on flat grass with your feet and flying away. This is the paradigm of shooting. The two paradigms of Guangdong and Fa are superimposed. A house that collapses like a piece of grass is the paradigm of ruin.

Idiom:

To use choking to waste one's health

To choke one's body to waste one's health is a Chinese idiom. The pinyin is yǐ yē fèi cān, which means that due to choking while eating, one has to go to the toilet Don't dare to eat anymore. It is a metaphor for stopping what you should do due to occasional setbacks. The source is "The Biography of He Chen in Southern History".

Everything that has been abandoned is put into action

It is a Chinese idiom, whose pinyin is bǎi fèi jù jǔ, which means that all things that have been abandoned are put into operation. From "Xu Zi Zhi Tong Jian·Song Lizong Shaoding Five Years".

Abolition of private affairs and public affairs

Abolish private affairs and public affairs, a Chinese idiom, whose pinyin is fèi sī lì gōng, which means to turn private affairs into public affairs. From "Warring States Policy·Yan Ceyi".

Forget sleeping and forgetting meals

Forget sleeping and forgetting meals, Chinese idiom, pinyin is fèi qǐn wàng cān, which means forgetting to sleep and not caring about eating. To describe working or studying with concentration or selflessness on something. From the preface to "Qushui Poems" by Wang Rong of the Southern Dynasties.