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Phrase(s): Come on in, the water’s fine!
1. Lit. Get into the water and swim! (Usually a polite command.) • As Todd swam along, he said to Rachel, "Come on in. The water’s fine." 2. Fig. to begin to do anything. • You will like skiing. Come on in, the water’s fine. • I think you would like working here, and I’m happy to offer you the job. Come on in, the water’s fine.
McGrawhill's American Idioms And Phrasal Verbs