Gaffe (noun)

1. A social blunder or mistake, especially one made in public.
2. A remark or action that is tactless or inappropriate.

Origin:

The word "gaffe" comes from the french word "gaffe" which means "a boating term referring to a boat hook". it was first used in the 19th century to mean a social blunder.

Examples:

1. He made a gaffe by mentioning her previous marriage.
2. The politician's gaffe cost him the election.
3. Her gaffe was the talk of the party.
4. He made a gaffe by telling a racist joke.
5. The company's gaffe in handling the crisis damaged their reputation.