This is the 2636th most frequent German word.
dahin
"Dahin" means "to there" or "to that place" in English.
Here, 'dahin' refers to a location towards which the subject is moving.
Ich gehe dahin, wo die Sonne scheint.
I go to where the sun shines.
In this sentence, 'dahin' refers to a point in time in the future.
Bis dahin ist noch viel zu tun.
Until then, there is much to do.
Here, 'dahin' metaphorically signifies being lost or gone in a final sense.