shirabe.org
1)
#39,520
Common
しご
Meaning
    1. ①
      dead language; extinct language
      But, then again, Latin was already a "dead language" by that time.
    2. ②
      obsolete word; dated word; word that has become passé
      See also: 廃語 (はいご)
      People don't say that anymore.
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