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The Collaborative International Dictionary
To bill and coo

Bill \Bill\, v. i. [imp. & p. p. Billed; p. pr. & vb. n. Billing.]

  1. To strike; to peck. [Obs.]

  2. To join bills, as doves; to caress in fondness. ``As pigeons bill.''
    --Shak.

    To bill and coo, to interchange caresses; -- said of doves; also of demonstrative lovers.
    --Thackeray.