English

Adjective

under one's hat ‎(not comparable)

1. (idiomatic) Concealed; confidential; secret.
   • 1939, G. M. (Review of General Manpower by John S. Martin)," Time, 30 Jan:

     Orestes Jones kept his real ambitions under his hat until the time struck.

Translations

References

• “under one's hat” in Dictionary.com Unabridged, v1.0.1, Lexico Publishing Group, 2006.