1. to think, to feel (Notable English members of the family are the counterparts of the German branch - to think and to thank (which originally was "give thoughts"))
Meanings
Word Family
Root: *tong-
The core idea of this root was:
thinking, feeling
So basically, it was about what is going on inside you.
It’s the origin of to think and to thank, which originally probably meant something like “thinking of someone with gratitude”.