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From The Collaborative International Dictionary of English v.0.48:
Nonplus \Non"plus`\, v. t. [imp. & p. p. Nonplusedor Nonplussed; p. pr. & vb. n. Nonplusing or Nonplussing.] To puzzle; to confound; to perplex; to cause to stop by embarrassment. [1913 Webster] He has been nonplused by Mr. Dry's desiring him to tell what it was that he endeavored to prove. --Spectator. [1913 Webster]