(imperative) It is not important; do not fret; used to reassure or comfort the person to whom it is said.I'm afraid I’ve broken your mug. — Never mind, it was old and I was going to throw it away.Did you fall over and hurt your knee? Never mind, I’ll put a bandage on it.
(imperative) Do not be concerned (about someone or something, or about doing something).Never mind about me — you go and I’ll join you later.''Here’s some money for you. Never mind about paying me back; you can keep it.
(imperative) Indicates a withdrawal of a previous statement.You're a fool. — What did you call me? — Never mind.
(idiomatic) Let alone; much less.They wouldn't go near that place, never mind spend an entire day there.