Original post at http://henrysthreads.com/2012/11/is-that-idiom-right/
We all use idioms, mostly unconsciously. There are a number that bother me that are in common usage, such as “I could care less” which developed from the more logical “I couldn’t care less.” But idioms often aren’t about logic. They’re about what people actually say, and what other people understand by what they say.
There’s a great article on this from a few weeks ago on Lingua Franca. Enjoy!