[f. FLAG v.3 and sb.2 + -ER1.]

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  1.  One who flags or lays down flagstones.

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1868.  Whitman, Poems, To Working Men, 6. Ship-carpentering, dock-building, fish-curing, ferrying, stone-breaking, flagging of side-walks by flaggers.

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  2.  slang. A street-walker.

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1865.  Daily Paper, Police Report (Farmer). She wasn’t a low sort at all—she wasn’t a Flagger, as we call it. So I replies, ‘I am well, thankee; and am happy to say I feel as such.’

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