ص د یṣ-d-y
(س) صَدِيَ يَصْدٰى صَدًيṣadiya yaṣdā ṣadany: to be very thirsty; also (of a sound) to come back (صَدًيṣadany = echo).
Form II (tafʿīl) صَدّٰى يُصَدِّيْ تَصْدِيَةًṣaddā yuṣaddī taṣdiyatan: to clap (the people of the Jāhiliyyah used to whistle and clap by the Kaʿbah). ﴿وَمَا كَانَ صَلَاتُهُمْ عِنْدَ الْبَيْتِ اِلَّا مُكَآءً وَّتَصْدِيَةً﴾ (Al-Anfāl 8:35)
Form V (tafaʿʿul) تَصَدّٰى يَتَصَدّٰى تَصَدِّيًاtaṣaddā yataṣaddā taṣaddiyan: to give someone one's full attention, to come face to face. ﴿فَاَنْتَ لَهُۥ تَصَدّٰى﴾ (ʿAbasa 80:6)This root occurs twice in the Quran.