Definition of "never mind"

never mind

/ˈnɛ.vɚˌmaɪnd/

verb
1. (hortative) It is not important; do not fret; used to reassure or comfort the person to whom it is said.
2. (hortative) Do not be concerned (about someone or something, or about doing something).
3. (hortative) Indicates a withdrawal or retractment of a previous statement.
4. (idiomatic) Let alone; much less.
  Quotations
  It’s remarkable that this game could have been even better than it was. The U.S. has rarely outplayed any opponent in its modern era of World Cup games, never mind a superpower that won its opener 6-2 over Iran.
  25 November 2022, Jonathan Tannenwald, “U.S. dominates England for long stretches, but plays to 0-0 tie at World Cup”, in The Philadeplhia Inquirer‎
noun
plural never minds
1. Alternative form of nevermind
  Quotations
  But close enough in spirit as to make no never mind.
  1998, Dana Stabenow, Fire and Ice, page 159