Source : Webster's Revised Unabridged Dictionary (1913)

   {Watch guard}, a chain or cord by which a watch is attached
      to the person.

   {Watch gun} (Naut.), a gun sometimes fired on shipboard at 8
      p. m., when the night watch begins.

   {Watch light}, a low-burning lamp used by watchers at night;
      formerly, a candle having a rush wick.

   {Watch night}, The last night of the year; -- so called by
      the Methodists, Moravians, and others, who observe it by
      holding religious meetings lasting until after midnight.
      

   {Watch paper}, an old-fashioned ornament for the inside of a
      watch case, made of paper cut in some fanciful design, as
      a vase with flowers, etc.

   {Watch tackle} (Naut.), a small, handy purchase, consisting
      of a tailed double block, and a single block with a hook.

Source : WordNet®

watch night
     n : a devotional service (especially on New Year's Eve)