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Webster 1913 Edition

Adj.

[

Sit

fast

Fixed; stationary; immovable.

[R.]

’T is good, when you have crossed the sea and back,
To find the

sitfast

acres where you left them.

Emerson.

Noun.

(Far.)

A callosity with inflamed edges, on the back of a horse, under the saddle.

Noun.

A hard knob growing on a horse's back under the saddle.

sitfast ‎(plural sitfasts)

sitfast ‎(not comparable)

Fixed; stationary; immovable.
- Emerson
  'Tis good, when you have crossed the sea and back, / To find the sitfast acres where you left them.