Is it off or of?upid

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Joined
7 Sep 2009
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464
Location
Manchester
Everyone in my office, when there talking about quantities say "7 off" or when it's written down, they would write 11 off for example. Surely its 15 of, as in 15 of something.

Now to me that sounds retarded, is it possible they are all stupid? Or is it that I have been saying it wrong my whole life.

Also it is not just in my office, people seem to be doing it everywhere, it just doesn't make sense.
 
You seem to be correct.

'Off' would only be correct if they were talking in the sense of taking something away, i.e. '5 off 30, leaving 25'.
 
It's 'off', similar to how you would describe something unique as a 'one off', not a 'one of'.

I'm not sure why it's like that but it's been around a long time, you'll notice it more around construction/engineering/military circles.
 
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