su·per·an·nu·ate /ˌsupɚ/
 (v.)變老朽;使退休


 Su·per·an·nu·ate v. t. [imp. & p. p. Superannuated p. pr. & vb. n. Superannuating.]
 1. To impair or disquality on account of age or infirmity.
 2. To give a pension to, on account of old age or other infirmity; to cause to retire from service on a pension.


 Su·per·an·nu·ate v. i. To last beyond the year; -- said of annual plants. [Obs.]

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 superannuate
      v 1: retire and pension (someone) because of age or physical
           inability
      2: declare to be obsolete
      3: become obsolete
      4: retire or become ineligible because of old age or infirmity