The distance that a rooster's crow can be heard, or a shot or throw aimed at a rooster or its target representation.
From 'cock' (rooster) + 'shot' (a throw, or distance). Used both literally (distance of a crow's sound) and in the game of cockshying (throwing at roosters).
In a time before loudspeakers or phones, the distance a rooster's crow carried was an actual unit of measurement—'just a cockshot away' meant a fairly short distance, within earshot of a loud farm bird.
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