Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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It was a surefire way of reminding the captains that men and frogs were brothers under the skin.

WORD ORIGIN

also sure-fire, by 1864, American English, from sure + fire (v.). Originally of rifles.

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.