Hi,
I recieved some coupon ads. A line read, "Cut It Out." It reminded me that 'cut it out' has another quite different meaning ----> stop doing sth. Why 'cut it out' means stop doing sth.?
Here's my opinion.
If you cut out a coupon from a magazine, you 'remove it' from the magazine.
If I 'cut out' my brother from my will, it means I remove him from it. If I 'cut out' salt from my diet, it means I remove salt from the list of things that I eat.
So, when your friend is playing loud music while you are trying to do your homework and you say 'Please cut it out', I think what you are really saying is 'Please remove that annoying activity from the things that you are doing' .
Best wishes, Clive