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Noddle \Nod"dle\, n. [OE. nodil, nodle; perh. fr. nod, because the head is the nodding part of the body, or perh. akin to E. knot; cf. Prov. E. nod the nape of the neck.] 1. The head; -- used jocosely or contemptuously.
noddle n : an informal British expression for head or mind; "use your noddle"