Adam Clarke on Isaiah 19:6

Shall turn the rivers far away "Shall become putrid" - האזניחו heeznichu. This sense of the word, which Simonis gives in his Lexicon, from the meaning of it in Arabic, suits the place much better than any other interpretation hitherto given; and that the word in Hebrew had some such signification, is probable from 2Chr 29:19, where the Vulgate renders it by polluit, polluted, and the Targum, by profaned, and made abominable, which the context in that place seems plainly to require. The form of the verb here is very irregular; and the rabbins and grammarians seem to give no probable account of it.