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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. Outdoing.] 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 performance. [PJC]