In baseball, hits that bounce along the ground rather than flying through the air, or people who work and live on the ground.
From 'ground' (Old English 'grund') plus the agent suffix '-er' meaning 'one who does.' The baseball term emerged in the 19th century American sport.
Baseball players actually prefer hitting grounders to certain batters because slow-hit balls on the ground can sometimes result in errors or force-outs—so what seems weak can actually be strategically smart!
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