Examples:

• When the teacher asked a question, the student who knew the answer had to button up their lip to give their classmates a chance to answer.
• At the meeting, the manager had to button up their lip and let their employees voice their opinions before making a decision.
• During the argument, I had to button up my lip and not say something hurtful that I would regret later.
• When the confidential information was leaked, the employee responsible was reminded to button up their lip and keep company secrets confidential.
• During the interview, the job candidate had to button up their lip and not reveal too much personal information.
• In the movie theater, the parents had to button up their lips and not talk during the movie, so as not to disturb other viewers.
• When the teacher caught the students passing notes, she reminded them to button up their lips and pay attention to the lesson.
• During the trial, the lawyer advised their client to button up their lip and not speak out of turn or say anything incriminating.
• In the library, the patrons had to button up their lips and be quiet, so as not to disturb others who were studying or reading.
• When the parents were discussing something private, the children were told to button up their lips and not listen in on the conversation.
• Please, button up your lip and keep the news secret till tomorrow.