If you reproach someone, you say or show that you are disappointed, upset, or angry because they have done something wrong.

If you look at or speak to someone with reproach, you show or say that you are disappointed, upset, or angry because they have done something wrong.

If you reproach yourself, you think with regret about something you have done wrong.

If you consider someone's actions or behaviour to be a reproach to a group of people, you consider them to be harmful or insulting to that group.