A fake fur or a fake painting, for example, is a fur or painting that has been made to look valuable or genuine, usually in order to deceive people.

If someone fakes something, they try to make it look valuable or genuine, although in fact it is not.

Someone who is a fake is not what they claim to be, for example because they do not have the qualifications that they claim to have.

If you fake a feeling, emotion, or reaction, you pretend that you are experiencing it when you are not.