Something that is broad is wide.

A broad smile is one in which your mouth is stretched very wide because you are very pleased or amused.

You use broad to describe something that includes a large number of different things or people.

You use broad to describe a word or meaning which covers or refers to a wide range of different things.

You use broad to describe a feeling or opinion that is shared by many people, or by people of many different kinds.

A broad description or idea is general rather than detailed.

A broad hint is a very obvious hint.

A broad accent is strong and noticeable.

Some men refer to women as broads. This use could cause offence.