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late 14c., "entertain by clowning or doing tricks," back-formation from juggler and in part from Old French jogler "play tricks, sing songs," from Late Latin ioculare (source of Italian giocolare), from Latin ioculari "to jest" (see jocular). Related: Juggled; juggling.
To alter, esp with a view to deception and advantage: Owners Might Juggle Lineup Before Facing Players/ They discovered that the CEO had been juggling the books (1813+)