To corrupt or undermine in morals; to destroy or lessen the effect of moral principles on; to render corrupt or untrustworthy in morals, in discipline, in courage, spirit, etc.; to weaken in spirit or efficiency.
- To undermine the confidence or morale of; dishearten: an inconsistent policy that demoralized the staff.
- To put into disorder; confuse.
- To debase the morals of; corrupt.