This is the 140th most frequent Tamil word.
தட
Mark, trace, or obstacle.
Here, "தட" refers to a trail left behind.
அவன் பாதையில் தடம் விட்டுவிட்டான்.
He left a trail on his path.
In this usage, "தட" is part of "தடை," meaning an obstacle or hindrance.
இதற்குத் தடை இல்லை.
There is no obstacle to this.
Here, "தட" denotes a base layer or a foundation.