English
flail tank
From flail + tank; From the flail chains attached to the rotating drum attached to the tank.
Today it means
noun a type of armored tracked fighting vehicle with a motorized spinning drum with the longitudinal axis of the drum arranged horizontally, perpendicular to the motion of the tank, with flail chains attached to the front end, which can clear landmines and barbed wire by beating them to bits
Language periods are conventional ranges, not dates for this word.
Etymograph / flail tank