expatiate (up)onவிவரிvivari(vevari)(6b tr)enlarge, expand, or describe; speak or draw out at length, as upon a theme
Usage:
பிரதமர் தன் திட்டத்தை எல்லா மந்திரிகளுக்கும் விவரித்தார்piratamar taṉ tiṭṭattai ellā mantirikaḷukkum vivarittār
pradamar tannooḍa tiṭṭatte ellaa mandirikkum vivariccaaru
The Prime Minister expatiated upon his plans to all the ministers.
