As meaning "a cutting from a plant," it is still good English. In this sense in Isa 17:10 for zemorah, "branch," "twig." For the phrase "slip of the tongue" compare Sirach 14:1; 19:16; 20:18; 21:7; 25:8.

See the definition of slip in the KJV Dictionary

Bible Verses by Topic Nave's Bible Concordance McClintock and Strong Biblical Cyclopedia Online Bible KJV Dictionary

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