Executed with the arm raised above the shoulder; overhand: an overarm throw.
Of, relating to, or being a stroke in swimming that is begun with the arm lifted and stretched forward over the shoulder.
o·ver·arm 2 (ō'vər-ärm') tr.v.
o·ver·armed, o·ver·arm·ing, o·ver·arms To supply (a nation, for example) with an excess of weaponry, especially nuclear missiles.