de-ka': Although this word is still in good use in both its literal sense, of the putrefaction of either animal or vegetable matter, and its derived sense, denoting any deterioration, decline or gradual failure, the Revised Version (British and American) has replaced it by other expressions in Le 25:35; Ec 10:18; Isa 44:26; Heb 8:13; in some of these cases with a gain in accuracy of translation. In Ne 4:10 (kashal, "to be feeble," "stumble") the Revised Version (British and American) retains "is decayed"; in Job 14:11 (charebh, "to be dried up") the American Standard Revised Version substitutes "wasteth," and in Joh 11:39 the American Standard Revised Version has "the body decayeth" instead of the more literal translation offensive to modern ears (ozei, "emits a smell").
⇒See the definition of decay in the KJV Dictionary
F. K. Farr