hehe, I minored in Linguistics at college....
you'd be surprised how many phrases we have that when you think about it, aren't grammatically correct because we really just borrowed them.
Of course I'm blanking on them right now, its been about 7 years since I studied this stuff, lol
The examples I remember most are that the word children is actually a double plural.... meaning we used to use the word childer for plural... but somewhere along the way it didn't seem plural enough and we made it childeren ... then dropped one of the e's
The other example is how the word chamber and camera not only mean the same thing... but that chamber actually morphed over time from the word camera
these changes happen when a country is conquered or occupied and languages/pronounciations blend together. So camera became chamera because the 'c' was pronounced 'ch' by some people... the 'b' was added because it just seems to fit phonetically with the way your mouth moves between the sounds.. chambera... and the a just dropped off... chamber
Then when the camera was invented... they reached back into latin I believe for camera obscura (dark chamber)... and tada.. we eventually just called it a camera
Ok... linguistics lecture over for the day, lol..