1. so long - Noun
2. so long - Interjection
a farewell remark
Source: WordNetLet them hate, so long as they fear. Lucius Accius
It doesn't make a difference how gradually you go so long as you don't stop. Confucius
Some people, because their minds have gone so long without nourishment, lose their desire to eat and so do not notice the harm they are suffering. Gregory Palamas
You walk so long with a jar for water, until the handle breaks off. Czech Proverb
You may preach ever so long to the wolf, he will nevertheless call for the lamb before night. Danish Proverb
Christmas has been talked of so long that it has come at last. French Proverb