A person who arrives at a place, or someone who competes or shows up for something.
From Old English 'cuman' meaning 'to come,' with the agent suffix '-er' added to make it 'one who comes.' Simple formation that's been in English for over a thousand years.
In sports, an 'upstart comer' suggests someone new and challenging established rules—it carries this exciting energy because 'coming' implies both arrival and the momentum of movement forward.
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