BEFOG
obscure, befog, becloud, obnubilate, haze over, fog, cloud, mist
(verb) make less visible or unclear; “The stars are obscured by the clouds”; “the big elm tree obscures our view of the valley”
Source: WordNet® 3.1
Etymology
Verb
befog (third-person singular simple present befogs, present participle befogging, simple past and past participle befogged)
To envelop in fog or smoke.
To confuse, mystify (a person); to make less acute or perceptive, to cloud (a person’s faculties).
To obscure, make less clear (a subject, issue, etc.).
Source: Wiktionary
Be*fog", v. t. [imp. & p. p. Befogged; p. pr. & vb. n. Befogging.]
1. To involve in a fog; -- mostly as a participle or part. adj.
2. Hence: To confuse; to mystify.
Source: Webster’s Unabridged Dictionary 1913 Edition