truckle

From Middle English trokel, trocle, trookyl, from Anglo-Norman trocle, from Medieval Latin trochlea (“a block, sheaf containing one or more pulleys”); or from a diminutive of truck (“wheel”), formed with -le, equivalent to truck + -le.

From a back formation of truckle bed (a bed on which a pupil slept, because it was rolled on casters into a lower position under the master's larger bed), from Middle English trookylbed. Compare also trundle bed. Assisted by false association with Middle English *trukelen, truken, trokien, trukien, from Old English trucian (“to fail, diminish”), Low German truggeln (“to flatter, fawn”), see truck.