Initiate tenant by courtesy

Initiate \In*i"ti*ate\, a. [L. initiatus, p. p.]
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   1. Unpracticed; untried; new. [Obs.] "The initiate fear that
      wants hard use." --Shak.
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   2. Begun; commenced; introduced to, or instructed in, the
      rudiments; newly admitted.
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            To rise in science as in bliss,
            Initiate in the secrets of the skies. --Young.
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   {Initiate tenant by courtesy} (Law), said of a husband who
      becomes such in his wife's estate of inheritance by the
      birth of a child, but whose estate is not consummated till
      the death of the wife. --Mozley & W.
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