What awful thing did Amnon do to his own sister, Tamar?

ANSWER

raped her

2nd Samuel 13 :

11 But when she took it to him to eat, he grabbed her and said, “Come to bed with me, my sister.” 12 “No, my brother!” she said to him. “Don’t force me! Such a thing should not be done in Israel! Don’t do this wicked thing. 13 What about me? Where could I get rid of my disgrace? And what about you? You would be like one of the wicked fools in Israel. Please speak to the king; he will not keep me from being married to you.” 14 But he refused to listen to her, and since he was stronger than she, he raped her.
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