Definify.com
Webster 1913 Edition
Thill
Thill
,Noun.
 1. 
One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft. 
2. 
(Mining) 
The floor of a coal mine. 
Raymond.
 Thill coupling
, a device for connecting the thill of a vehicle to the axle.
 Webster 1828 Edition
Thill
THILL
,Noun.
  Definition 2025
thill
thill
English
Alternative forms
- fill (dialectal)
 
Noun
thill (plural thills)
- One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft.
 -  The thin stratum of underclay which lies under a seam of coal; the bottom of a coal-seam.
-  1888, Rudyard Kipling, ‘At Twenty-two’, In Black and White, Folio Society 2005, p. 405:
- One by one, Janki leading, they crept into the old gallery – a six-foot way with a scant four feet from thill to roof.
 
 
 -  1888, Rudyard Kipling, ‘At Twenty-two’, In Black and White, Folio Society 2005, p. 405: