so long

[soʊ lɔːŋ]

Definition:
1. See you later; goodbye.

Use 'so long' in a sentence:

1. It’s been good talking to you. So long.
2. So long for now. I’ll see you soon.
3. "Be careful!" — "Sure thing, Dad. So long."
4. Well, so long, pal, see you around.