Above-board. In open fight; without artifice or trick. A figurative expression, borrowed from gamesters, who, when they put their hands under the table, are changing their cards. It is used only in familiar language.
It is the part also of an honest man to deal above-board, and without tricks. L'Estrange.
Though there have not been wanting such heretofore, as have practised these unworthy arts (for as much as there have been villains in all places, and all ages) yet now-a-days they are owned above board. South's Sermons.