to be reckoned with

From reckon with.

to be reckoned with

1. Too powerful or important to be ignored.

   a force to be reckoned with

• name to conjure with

• “to be reckoned with”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “to be reckoned with”, in Collins English Dictionary.
• “a force to be reckoned with”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.
• “a force to be reckoned with” (US) / “a force to be reckoned with” (UK) in Macmillan English Dictionary.
• “reckon with” in Longman Dictionary of Contemporary English, Longman.