I have read something in the newspaper about plans to reduce emissions of harmful gases and the word 'half' appeared in both 'cut nitrogen oxide emissions in half' and 'cut nitrogen oxide by half'.
I'm wondering if there's any difference between cut sth in half and cut sth by half.
Thanks a lot:)
Not a teacher.
They are the same in this context, meaning that the goal is to reduce the number to 50% of its present value.
Now, if you were to actually divide something, like a cake, into two parts, that would be "cutting it in half," not "by" half.