befog

verb3

1. •
   To envelop in fog or smoke.

   • Clouds of the most expensive incense befog the chancel […] — 1916
2. •
   To confuse, mystify (a person); to make less acute or perceptive, to cloud (a person’s faculties).

   • The voice of interested sycophancy is apt to fill their ears and to befog their judgment. — 1871
3. •
   To obscure, make less clear (a subject, issue, etc.).

   • How they had managed to befog the subject! What elaborate show-structures they had built up, with no result but to obscure the horizon! — 1880