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In page Foot:

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The word "footloose" was first used in the 1690s, meaning "free to move the feet, unshackled"; the figurative sense of "free to act as one pleases" was first used in 1873. Like "footloose", "flat-footed" at first had its obvious literal meaning (in 1600, it meant "with flat feet") but by 1912 it meant "unprepared" in U.S. baseball slang.[citation needed]