v.tr. (usu. refl.) lower the dignity of (would not demean myself to take it).
Etymology: DE- + MEAN(2), after debase
2.
v.refl. (with adv.) behave (demeaned himself well).
Etymology: ME f. OF demener f. Rmc (as DE-, L minare drive animals f. minari threaten)
Useful english dictionary. 2012.