1
general::
Domineer over, act arrogantly toward, as in After Mary was elected president, she tried to lord it over the other girls. [Late 1500s] Also see QUEEN IT.
American Heritage Idioms
2
general::
Phrase(s): lord it over someone
Fig. to dominate someone; to direct and control someone. • Mr. Smith seems to lord it over his wife. • The boss lords it over everyone in the office.
McGrawhill's American Idioms And Phrasal Verbs