to double
ka.phal describes making something twofold, whether a curtain, a breastpiece, or a road for a sword.
The dominant attested use describes an object made twofold: a curtain is treated this way in Exodus 26:9, and the breastpiece is described this way in Exodus 28:16 and Exodus 39:9. Ezekiel 21:19 applies the term to the marked-out road for the sword, though the translation does not isolate its contribution with the same clarity.
Senses in use
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Making an object twofold · dominant
In Exodus 26:9, the Qal sequential perfect occurs in the instruction concerning the sixth curtain; the APB renders the clause, "and you shall double the sixth curtain opposite the front of the tent." In Exodus 28:16 and Exodus 39:9, Qal passive participles describe the breastpiece; the APB renders it "doubled" alongside its square dimensions.
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A road marked out in relation to the sword · rare
In Ezekiel 21:19, the Niphal jussive occurs within instructions to mark out two roads for the sword of the king of Babylon. The APB renders the surrounding directions as "Mark out two roads" and later "mark out a way," but its loose wording does not identify a separate English rendering for this form.
In the Anselm Project Bible: The APB explicitly uses "double" and "doubled" for the curtain and breastpiece passages. In Ezekiel 21:19 it presents the surrounding instruction with "Mark out two roads" and "mark out a way"; The form's specific English equivalent there remains uncertain.