on a power trip

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on a power trip

Engaged in a period of exerting an excessive degree of control or authority over others, especially as a means of inflating or bolstering one's ego or self-worth. Tom has been on a real power trip ever since he was promoted to regional manager. She's been on a power trip hacking into the school's online infrastructure to mess with people's grades and personal details. I think getting expelled affected her a lot more than she let on.
See also: on, power, trip

*on a power trip

exercising power and authority, especially unduly. (*Typically: be ~; be off ~; go ~; have ~.) Old Molly is off on a power trip again. She loves ordering everyone about.
See also: on, power, trip