صَدْرَكَ

صَدْرَكَ is a phrase (شِبْهُ الجُمْلَةِ) consisting of a possessed noun and an attached, second-person, singular, possessive pronoun

PhraseNoun / NounNoun Noun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun/ownerNoun possessed/owned
chest of yoursصَدْرَكَ=كَ+صَدْرَ
your chestyourschest of
Surah/Below is the only verse in the holy Quran containing the nominal compoundصَدْرَكَ
Verse
94-1Have We not opened up for you your breast?أَلَمْ نَشْرَحْ لَكَ صَدْرَكَ