• Webster's Revised Unabridged Dictionary
    • v. t Disacknowledge To refuse to acknowledge; to deny; to disown.
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Century Dictionary and Cyclopedia
    • disacknowledge To refuse to acknowledge; disown.
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Chambers's Twentieth Century Dictionary
    • v.t Disacknowledge dis-ak-nol′ej to refuse to acknowledge, disown.
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In literature:

Circumstances have made them dependent on you, and you certainly are not the man to disacknowledge the burden.
"The Bertrams" by Anthony Trollope