Keep smiling informal verb phrase
To maintain a positive and optimistic attitude or demeanor, especially in the face of hardship or adversity
I know you're worried about your father's health, but you try to keep smiling.
A: My first day at work was bad. B: Keep smiling! Don't be discouraged! You will get used to it soon.
To make someone feel more confident or happy, especially when they thought that they can't achieve what they want
Happy or cheerful; in a good mood
To smile broadly
A remark you make when you are leaving on the purpose of creating a stronger impact
The letter he left before leaving was his parting shot.