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Phrase(s): maiden voyage
Fig. the first voyage of a ship or boat. • The liner sank on its maiden voyage. • Jim is taking his yacht on its maiden voyage.
McGrawhill's American Idioms And Phrasal Verbs
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The first experience, as in This tennis tournament is my maiden voyage in statewide competition. This term, originally meaning the first voyage of a ship, was first recorded in 1901, but the use of maiden to signify "the first time" dates from the mid-1500s.
American Heritage Idioms