overhand (adv.)

1570s, "upside down," from over- + hand. Sense in tennis, etc., "with the hand above that which is gripped," is by 1861. As an adjective, of throws, strokes, or bowls, "done with the hand raised above the shoulder," it is recorded by 1828 (in cricket), originally over-handed. Middle English had over-honde as a noun, "mastery, victory" (compare upper hand).

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Definitions of overhand from WordNet

overhand (adj.)
with hand brought forward and down from above shoulder level;
an overhand pitch
an overhand stroke
Synonyms: overhanded / overarm
overhand (adj.)
sewn together with overhand stitches (close vertical stitches that pass over and draw the two edges together);
Synonyms: oversewn