Here’s a description for a WordPress post tag with the title “成語” in Traditional Chinese, designed to be informative and engaging:

**Description:**

**成語 (chéngyǔ)** – 蘊含著豐富歷史和文化的四字成語，是中文中最精煉、充滿智慧的表達方式之一。此標籤收錄包含成語的文章，這些作品將深入探討成語的典故、意思、用法、以及在現代中文中的應用。無論您是想增進中文理解能力、提升寫作技巧，或是單純對中華文化有興趣，這裡都是您探索成語世界的理想起點。 透過我們精選的文章，您將能學習如何活用這些充滿詩意和力量的詞彙，讓您的表達更加生動、深刻，並更深入地了解中華文化的精髓。

**Translation (for reference):**

**”Idioms (chéngyǔ)”** – Four-character idioms brimming with rich history and culture. They are one of the most concise and wise forms of expression in the Chinese language. This tag includes articles related to idioms, exploring their origins, meanings, usage, and applications in modern Chinese. Whether you’re looking to enhance your Chinese comprehension, improve your writing skills, or are simply interested in Chinese culture, this is the ideal starting point to explore the world of idioms. Through our carefully selected articles, you will learn how to effectively use these poetic and powerful phrases, making your expressions more vivid, profound, and gaining a deeper understanding of the essence of Chinese culture.

**Key elements and why they’re included:**

* **Clear Definition:** Starts by stating the basic concept of “成語” – that they are four-character idioms.
* **Cultural Significance:** Highlights the historical, cultural, and wisdom aspects of成語, emphasizing their importance.
* **Focus on Value:** Addresses the benefits the reader will gain, such as improved comprehension, writing skills, and cultural understanding.
* **Target Audience Appeal:** Appeals to a broad audience, from language learners to cultural enthusiasts.
* **Encouragement:** Encourages the reader to actively explore and learn about idioms.
* **Keywords Integrated:** Naturally integrates keywords like “典故 (origins), 意思 (meaning), 用法 (usage), 現代中文 (modern Chinese) and 中華文化 (Chinese Culture)” which help in SEO.
* **Concise and Engaging Language:** Uses clear, concise language to describe the tag’s purpose.
* **Traditional Chinese:** The description is written wholly in Traditional Chinese, as the title specified.

This description will help users understand what this tag covers and why they might want to explore articles under it. Remember to save the tag description within WordPress settings.