de-

de- [dē, di, də]

[L, a prefix signifying separation, cessation, intensification, or contraction; also < Fr dé- (< L de) or OFr des- (< L dis-): see DIS-] prefix

1. away from, off [debar, derail]

2. down [degrade, decline]

3. wholly, entirely [defunct]

4. reverse the action of; undo [defrost, decode]