thill ( synonym found)
Definition of thill:

°The thin stratum of underclay which lies under a seam of coal; the bottom of a coal-seam.
°One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft.
Definition of thill:

°The thin stratum of underclay which lies under a seam of coal; the bottom of a coal-seam.
°One of the two long pieces of wood, extending before a vehicle, between which a horse is hitched; a shaft.
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