The Collaborative International Dictionary of English v.0.48:

Bemoan \Be*moan"\, v. t. [imp. & p. p. Bemoaned; p. pr. & vb.
   n. Bemoaning.] [OE. bimenen, AS. bem?nan; pref. be- + m?nan
   to moan. See Moan.]
   To express deep grief for by moaning; to express sorrow for;
   to lament; to bewail; to pity or sympathize with.
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         Implores their pity, and his pain bemoans. --Dryden.
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   Syn: See Deplore.
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