FORFEND
debar, forefend, forfend, obviate, deflect, avert, head off, stave off, fend off, avoid, ward off
(verb) prevent the occurrence of; prevent from happening; “Let’s avoid a confrontation”; “head off a confrontation”; “avert a strike”
Source: WordNet® 3.1
Etymology
Verb
forfend (third-person singular simple present forfends, present participle forfending, simple past and past participle forfended)
(dated) To prohibit; to forbid; to avert.
Usage notes
• This word is dated and becoming obsolete. Mostly used now in set expressions such as heaven forfend.
Anagrams
• nroffed
Source: Wiktionary
For*fend", v. t. Etym: [Pref. for- + fend. See Forewend.]
Definition: To prohibit; to forbid; to avert. [Archaic]
Which peril heaven forefend! Shak.
Note: This is etymologically the preferable spelling.
Source: Webster’s Unabridged Dictionary 1913 Edition