Jamieson-Fausset-Brown Bible Commentary

Tamar put ashes on her head, and rent her garment of divers colours . . . laid her hand on her head, and went on crying--that is, sobbing. Oriental manners would probably see nothing beyond a strong sense of the injury she had sustained, if Tamar actually rent her garments. But, as her veil is not mentioned, it is probable that Amnon had turned her out of doors without it, and she raised her hand with the design to conceal her face. By these signs, especially the rending of her distinguishing robe, Absalom at once conjectured what had taken place. Recommending her to be silent about it and not publish her own and her family's dishonor, he gave no inkling of his angry feelings to Amnon. But all the while he was in secret "nursing his wrath to keep it warm," and only "biding his time" to avenge his sister's wrongs, and by the removal of the heir-apparent perhaps further also his ambitious designs.