Look up destabilise in Wiktionary, the free dictionary.
The word destabilisation can be applied to a wide variety of contexts such as attempts to undermine political, military or economic power. In a psychological context it is used as a technique in brainwashing and abuse to disorient and disarm the victim. For example, in the context of workplace bullying, destabilisation applied to the victim may involve:
failure to acknowledge good work and value the victim's efforts
allocation of meaningless tasks
removal of areas of responsibility without consultation