bill(redirected from bills and coo)
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Abbreviation for bass increase at low levels , under level.
Arthur H., U.S. obstetrician, 1877-1961. See: Bill maneuver.
1. A structure projecting from the head of a bird, consisting of the jaws and their horny covering and including the upper and lower mandibles; a beak.
2. A similar horny mouth part, such as that of a turtle.