Used as a polite farewell to a visitor, inviting a return visit.
A polite formula used when one has not heard or understood what has been said, or to indicate surprise.
It is not important; do not fret; used to reassure or comfort the person to whom it is said.
Do not be concerned (about someone or something, or about doing something).
Indicates a withdrawal or retractment of a previous statement.
Let alone; much less.