Fly rail

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a bracket which turns out to support the hinged leaf of a table.

See also: Fly

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Each goes to a block and down to the fly rail. The line descends offstage of the ladders to the second fly gallery where it appears to rub against the support beam on the offstage side.