Simple past tense and past participle of friend.(verb)
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Use "friended" in a sentence
"To exclude just a few friends - your boss, maybe, or that nosy co-worker you reluctantly "friended" - type their names into the "Hide this from" box."
"There may be a few people who have this username friended, but avoid my Betty journal fear of pop, perhaps?"
"Every chicken is "friended" on Facebook before it is fried and consumed."