Honorific term used to refer to people outside one's own group, showing respect. Often used when speaking about strangers, customers, or people in general in a polite context.
You mustn't say such a thing in front of other people.
You must not cause trouble for others.
Let's be careful not to cause trouble for other people.
You mustn't do embarrassing things in front of other people.
If you go out dressed like that, other people will laugh at you.