TV series example of the word

The Big Bang Theory Season 4, Episode 24
You should feel a small node-like object rolling back and forth along the bone.

The Big Bang Theory Season 7, Episode 17
Well, we just... we e-mailed back and forth a bit,

The Big Bang Theory Season 12, Episode 24
We were passing the lime back and forth.

Vikings Season 1, Episode 6
to me and to my family from this day forth?

Game of Thrones Season 2, Episode 9
Your king rides forth to battle.