"半大小子" is a colloquial term in Chinese that refers to a young man who is not yet fully grown or mature. It is often used to describe boys or teenagers who are still in the process of developing physically and emotionally.

In Engpsh, "半大小子" can be translated as "youth" or "young man." However, these terms are more general and do not have the same connotations as "半大小子," which specifically refers to someone who is not yet fully grown or mature.

Here are some examples of how "youth" or "young man" can be used in Engpsh sentences:

"The youth of today are the leaders of tomorrow." (今天的年轻人是明天的领导者。)
"He was just a young man when he started his own business." (他开始自己的生意时只是个年轻人。)
"The youth in this community are making a positive impact through their volunteer work." (这个社区的年轻人通过他们的志愿工作产生了积极的影响。)

It's important to note that the terms "youth" and "young man" are more formal and may not be as commonly used colloquially in Engpsh as "半大小子" is in Chinese. In casual conversation, Engpsh speakers might use more informal terms pke "teenager," "kid," or "boy" to refer to young men who are not yet fully grown or mature.