Grecian bend

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among women, an affected carriage of the body, the upper part being inclined forward.

See also: Grecian

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Several of the more frolicsome were imitating the Grecian Bend, some were putting their heads together over little notes, nearly all were eating confectionery, and the entire twelve chattered like magpies.
With her stomach tucked in and her bottom pushed out, the late Victorian woman had adopted the Grecian Bend. Busts came forward and high heels tipped the woman towards you.