Definition of Befriend

Babylon English Dictionary
act as a friend to; assist, aid, stand by
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Befriend Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(v. t.)
To act as a friend to; to favor; to aid, benefit, or countenance.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

befriend
\be*friend"\ (&?;), v. t. [imp. & p. p. befriended; p. pr. & vb. n. befriending.] to act as a friend to; to favor; to aid, benefit, or countenance. by the darkness befriended.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
To be a friend to, especially when in need.
The Devil's Dictionary
Befriend, (v.t.)

To make an ingrate.
  
The Devil's Dictionary, by Ambrose Bierce, 1911 (About)
WordNet 2.0

Verb
1. become friends with; "John and Eric soon became friends"; "Have you made friends yet in your new environment?"
(hypernym) bind, tie, attach, bond
(hyponym) pal, pal up, chum up