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I've never seen "Add-in salt to injury" but I know "Add insult to injury" exists. I had a grammar exercise that asked for the most suitable idiom or proverb for expressing:
To make something bad become worse
So I wrote "Add insult to injury". But the scheme says the correct answer is "Add-in salt to injury". So, which one is correct?
I've googled for "Add-in salt to injury" but the only result was the "add insult" version.
12The usual idiom is "rub salt into a wound". – Mick – 2016-11-05T22:57:18.517
5You should cite where you found this exercise, if nothing else, users would learn to avoid using it. – Mari-Lou A – 2016-11-05T23:12:19.663
@Mari-LouA This has been circulating for a while in the world of IELTS; see this search.
– P. E. Dant Reinstate Monica – 2016-11-05T23:27:41.607