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naysay

[ney-sey]
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verb (used with object), nay·said, nay·say·ing.
  1. to say nay to; deny; reject; oppose.

Origin of naysay

1765–75; nay + say1, or by back formation from naysayer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018