Translation

広める / 普及させる / 伝播させる

Meaning

Propagate means to spread an idea, belief, method, or information so that more people accept or use it. It often sounds formal and can be neutral or negative, especially with rumors, myths, or propaganda. Do not confuse it with promulgate, which stresses official announcement.

Examples

• その団体は新しい教育方法を全国に広めようとしました。
  The organization tried to propagate a new teaching method nationwide.
• その投稿は誤った噂を広めるだけでした。
  The post only propagated a false rumor.