The line on a horse's body where the girth is fitted, often used as a measurement point for saddle placement.
Compound word from 'girth' (Old Norse 'gjörð') and 'line', showing English's ability to create precise technical vocabulary through combination.
Equestrian terminology is incredibly specific because horses cost fortunes and poorly fitting equipment means an injured or dead horse—a disaster for medieval nobility. Words like 'girthline' reveal an entire lost vocabulary of people who understood horses the way modern mechanics understand cars.
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