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on the alert

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Watchful, fully prepared, as in The inspectors are always on the alert for a manufacturing error. [Late 1700s]

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“Evoke” and “invoke” both derive from the same Latin root “vocāre.”

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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