Simple past tense and past participle of forewarn.(verb)
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Use "forewarned" in a sentence
"He also touches upon the theory behind legal education itself which provides a useful view into the heads of Canadian law school administrators everywhere (forewarned is forearmed)."
"But forewarned is forearmed, and four armed is usually a defect in early limb development related to abnormal patterning of the developing limb bud."
"My decision surprised me, because normally I am a “forewarned is forearmed” kind of person."