to outdo oneself

From The Collaborative International Dictionary of English v.0.48:

Outdo \Out*do"\ (out*d[=oo]"), v. t. [imp. Outdid
   (out*d[i^]d"); p. p. Outdone (out*d[u^]n"); p. pr. & vb. n.
   To go beyond in performance; to excel; to surpass.
   [1913 Webster]

         An imposture outdoes the original.       --L' Estrange.
   [1913 Webster]

         I grieve to be outdone by Gay.           --Swift.
   [1913 Webster]

   To outdo oneself to surpass one's own previous best
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