liar

A liar is someone who tells false or untrue things.

When people call someone a liar, they usually mean that this person has been telling lies to others. This can happen at home, school, or even in public places. For example, if you tell your friend that you went to the movies when really you stayed home, and your friend finds out about it, they might say you lied to them. Lying can be a serious issue because it can hurt people's trust in us.