The Collaborative International Dictionary
To bill and coo
Bill \Bill\, v. i. [imp. & p. p. Billed; p. pr. & vb. n. Billing.]
To strike; to peck. [Obs.]
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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.