befog

1. To cover or obscure with or as if with fog.
2. To cause confusion in; muddle.

verb

To make dim or indistinct: becloud, bedim, blear, blur, cloud, dim, dull, eclipse, fog, gloom, mist, obfuscate, obscure, overcast, overshadow, shadow. See clear/unclear.

The verb has one meaning:

Meaning #1: make less visible or unclear
  Synonyms: obscure, becloud, haze over, fog, cloud, mist