🐎 A horse's wound 😣 A skin irritation

saddle sore

8.1

A damaged area on a horse's back caused by a badly fitted saddle rubbing

noun
/ˈsædəl sɔr/

: rozadura

If the saddle doesn't fit properly, it can quickly lead to painful saddle sores.

Examples

You have a little saddle sore on that white horse of yours?

Someone Like You... (2001)
After a long day of riding, I noticed a saddle sore developing on my horse's back.
He applied ointment to the saddle sore on his horse to help it heal faster.

Synonyms

sore

vssaddle sore

49 2.2

A painful spot on the skin that is open or infected

refers specifically to a horse back lesion from ill fitting riding equipment

gall

vssaddle sore

8.1

A sore on the skin caused by rubbing, like from a backpack

is a horse back lesion caused by ill fitting riding equipment

How Severe

ulcer

81 3.7

raw wound

NSFW

1 6.6

saddle sore

8.1

bruising

64 2.4

alopecia

Specialized

4 8.1

Surface Forms

saddle sore singular

saddle sores plural

Morphology

saddle + sore

The meaning 'a sore or lesion caused by an ill-fitting saddle' is directly and literally built from 'saddle' (the riding seat) + 'sore' (a painful lesion). This noun-noun compound is compositional and follows a common descriptive pattern, so a B1 learner who knows both constituents can readily infer the MWE's meaning.

Etymology

Saddle sore (for horses) comes from a saddle that sits badly on a horse and rubs its back, making a sore, so the phrase means a sore spot on a horse caused by the saddle.