don't mention it
• a polite expression used to indicate that thanks or an apology are not necessary.
• "‘Thanks very much.’ ‘Don't mention it, dear boy.’"
Similar:
don't apologize,
it doesn't matter,
it makes no difference/odds,
it is unimportant,
that's all right,
never mind,
don't worry,
not to mention
• used to introduce an additional point which reinforces the point being made.
• "I'm amazed you find the time, not to mention the energy, to do any work at all"
Similar:
in addition to,
as well as,
not counting,
not including,
to say nothing of,
aside from,
besides,
