never mind
never mind {v. phr.}
Don't trouble about it; don't worry about it; forget it; skip it. — Usually used in speaking or when writing dialogue.
Never mind preparing a picnic lunch; we'll find a lunchstand when we get to the beach.
"What did you say?" "Oh, never mind."
"What about money?" "Never mind that. I'll take care of it."
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Source: A Dictionary of American Idioms