Preserve it in Colloquial

Accent is something other people have.

Kind of the same with colloquialism too. I came to realize only when I moved to Chennai that many of the bread-and-butter usages in my Tamil were local to Madurai. However certain colloquialisms seem to be chaste expressions that have lost currency in the more 'formal' language that exists today. I keep running into them very now and then. Here's the most recent one...

மொத்து a common expression for 'a good thrashing' is something I haven't heard outside Madurai.

Yesterday I was in Thiruvaathavoor. Birthplace of the poet-saint ManickavAsagar. The temple of had a sannidhi for him with one of his poems written in a plaque outside. Describes legends about SivaperumAn including the story of how he was whipped by a Pandiyan King.

பண்சுமந்த பாடற் பரிசு படைத்தருளும்
பெண்சுமந்த பாகத்தன் பெம்மான் பெருந்துறையான்
விண்சுமந்த கீர்த்தி வியன்மண்ட லத்தீசன்
கண்சுமந்த நெற்றிக் கடவுள் கலிமதுரை
மண்சுமந்து கூலிகொண் டக்கோவால் மொத்துண்டு
புண்சுமந்த திருமேனி பாடுதும்காண் அம்மானாய்