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From The Collaborative International Dictionary of English v.0.48:
Nod \Nod\, v. t. [imp. & p. p. Nodded; p. pr. & vb. n. Nodding.] 1. To incline or bend, as the head or top; to make a motion of assent, of salutation, or of drowsiness with; as, to nod the head. [1913 Webster] 2. To signify by a nod; as, to nod approbation. [1913 Webster] 3. To cause to bend. [Poetic] [1913 Webster] By every wind that nods the mountain pine. --Keats. [1913 Webster]