never mind

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb Used other than as an idiom: see never,‎ mind.
• verb imperative It is not important; do not fret; used to reassure or comfort the person to whom it is said.
• verb imperative Do not be concerned (about someone or something, or about doing something)
• verb imperative Indicates a withdrawal of a previous statement.