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steady as a rock

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Firm, dependable, as in Betty always knows her part; she's steady as a rock. This simile uses rock in the sense of “something that affords a sure support,” a usage dating from the early 1500s.

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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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