"Button one's lip" is an idiomatic expression often used informally. It means to remain silent or refrain from speaking, especially in a situation where one may be tempted to reveal information or opinions. It is often used as an admonition or a reminder to someone to keep quiet or maintain confidentiality.
The phrase "button one's lip" is believed to have originated in the early 20th century and has a slightly confrontational tone. It implies the need to physically close or control one's mouth as if buttoning it up, suggesting a deliberate effort to keep thoughts or words inside. The idiom is commonly used when someone leaks sensitive or confidential information, talks too much, gossips, or criticizes excessively. It serves as a reminder to exercise self-control and maintain discretion.
The phrase "button one's lip" conveys the importance of silence or restraint in certain situations. It suggests that sometimes it is better to withhold one's thoughts or opinions to avoid conflict, maintain privacy, or protect oneself or others from potential harm. This idiomatic expression is often used in informal conversations or light-hearted contexts to remind someone to stay quiet or not share unnecessary or unwanted information.