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Definition of for- in English:

for-

prefix

  • 1Denoting prohibition.

    • ‘forbid’

  • 2Denoting abstention, neglect, or renunciation.

    ‘forgive’
    • ‘forget’
    • ‘forgo’

  • 3Denoting extremity of negative state expressed.

    ‘forlorn’
    • ‘forsake’

Origin

Old English.