From The Collaborative International Dictionary of English v.0.48:

Underline \Un`der*line"\, v. t.
   1. To mark a line below, as words; to underscore.
      [1913 Webster]

   2. To influence secretly. [Obs.] --Sir H. Wotton.
      [1913 Webster]

   3. Emphasize or call attention to; highlight; as, Long waits
      at the emergency room underline the need for a larger

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