Not . . . but

from The Collaborative International Dictionary of English v.0.48

Not \Not\, adv. [OE. not, noht, nought, naught, the same word as
   E. naught. See {Naught}.]
   A word used to express negation, prohibition, denial, or
   refusal.
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         Not one word spake he more than was need. --Chaucer.
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         Thou shalt not steal.                    --Ex. xx. 15.
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         Thine eyes are upon me, and I am not.    --Job vii. 8.
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         The question is, may I do it, or may I not do it? --Bp.
                                                  Sanderson.
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   {Not . . . but}, or {Not but}, only. [Obs. or Colloq.]
      --Chaucer.
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