good day—
1. one’s lucky day; a day favorable for smth.:
- Monday was a good day for the mayor because all the major players from both parties were willing to play along.
2. a day on which the weather is fine:
- It was a good day and we had perfect weather conditions in Cumbria, no rain at all.
3. is used as a formal phrase at parting:
- And to marry for money, I think the wickedest thing in existence. Good day.
well day—a day on which a person is free from sickness, especially from an attack of an intermittent disorder:
- As it was one of his well days, he walked in without help.