secret admirer

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secret admirer (plural secret admirers)

1. One who admires another romantically but purposely remains anonymous to the extent that the subject of the admiration is unaware of the admirer's identity.

   I received a Valentine's card from my secret admirer.

• “secret admirer”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.
• “secret admirer”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.