The Collaborative International Dictionary
Flatwise \Flat"wise`\, a. or adv. With the flat side downward, or next to another object; not edgewise.
Wiktionary
adv. With a flat side down or otherwise in contact with a flat surface. alt. With a flat side down or otherwise in contact with a flat surface.
Usage examples of "flatwise".
With prickly seconds, or less tolerably With dull-blade minutes flatwise slapping me.
Jim snapped the nose of the little flier down and they power-dived to within a few yards of the sand before he set the plane on its tail and skidded flatwise to kill speed.
Nine chances out of ten, if Donnegan had fallen flatwise upon this alert enemy, he would have received those knees in the pit of his own stomach and instantly been paralyzed.
A large arrow-head of chalcedony has been bound with cords of cotton flatwise along one side of the body.
He turned the scrap of wood sideways and no amount of pressure could bend or snap it, but when he bent it again flatwise it snapped easily.