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1. pl. flat·feet (-fēt′) A condition in which the arch of the foot is abnormally flattened down so that the entire sole makes contact with the ground.
2. pl. flat·foots
a. Informal A person with flat feet.
b. Slang A police officer.
intr.v. flat·foot·ed, flat·foot·ing, flat·foots
To walk in a flat-footed manner: "He flatfooted along, twirling his club" (James T. Farrell).
1. having flatfeet.
2. firm and explicit: a flatfooted denial.
3. clumsy or plodding: flatfooted writing.Idioms:
catch someone flatfooted, to catch someone unprepared or in the midst of a transgression.