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CROSS. contracts. A mark made by persons who are unable to write, instead of their names.
     2. When properly attested, and proved to have been made by the party whose name is written with the mark, it is generally admitted as evidence of the party's signature.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Cross fingers, everything goes alright for him on Saturday now."
TOUCH WOOD, cross fingers and anything else I can think of to stop me catching flu, I shall do.
He's managing to cope with the HIV and is, cross fingers, mostly well.