from The Century Dictionary.
- noun An instrument to thresh or thrash with; a flail.
Sorry, no etymologies found.
Over the door and on the threshel were nailed, for luck, two horse-shoes, that had been found by accident.
The Lianhan Shee 1921
"Wid the help o 'God, my foot won't cross the threshel," replied
a minute in her hand, at long last he gave it to her; she then struck it three times on the threshel of the door, and, giving it back into his hand, tould him to try what he could do.