sitfast
noun
a sore on a horse's back caused by rubbing of the saddle
Word Origin for sitfast
C17: from sit + fast 1 (in the sense: secure, fixed)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for sitfast
Historical Examples of sitfast
The precursor of the sitfast is always a swelling filled with serum and lymph, caused, as before stated, by badly-fitting harness.
Cooley's Practical Receipts, Volume IIArnold Cooley
Animals obtained from natives not unfrequently suffer from a peculiar description of gall, known as a “sitfast.”