The short lines that run parallel to the sidelines on a football field, marking yard intervals and serving as reference points for ball placement. They help officials spot the ball consistently and provide visual guides for players and coaches.
From 'hash' (short lines or marks, possibly from 'hatch' meaning to mark with lines) and 'marks.' The term comes from the resemblance of these field markings to hash marks or tick marks used in counting or measurement.
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