What is the origin of the idiom "sit tight" and when to use it?

The origin of the idiom "sit tight" can be traced back to the use of the word "tight" in the sense of "firmly" or "securely." The phrase originated in the early 19th century and is believed to have its roots in the language of horseback riding. In equestrian terms, "sit tight" referred to maintaining a secure and balanced position while riding, especially during challenging or unpredictable moments. It is commonly used in situations that require individuals to exercise patience, such as during uncertain or critical moments, when awaiting important information or instructions, or when dealing with potential risks or challenges.