What does mean "M.O." here? I have found a list of possible meanings for this acronym but do not know which applies.

“Some people collect cars,” Fieldly says. “That’s not his M.O.—Carl collects businesses.”


1 Answer 1


It means "modus operandi", a holdover phrase from Latin which means literally "mode of operation". A person's M.O. describes their habits and typical routines and behaviors.

  • Specifically it is a legal phrase, refering to the way that criminal commits crimes, which can be used as evidence that the same person committed a series or crimes.
    – James K
    Apr 15, 2021 at 7:41

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