Longman Dictionary of Contemporary English homepage

that

3 adverb
     
that3 S1 W2 [+ adjective/adverb]
1 spoken used to say how big, how much etc, especially when you are showing the size, amount etc with your hands:
It was quite a large fish - about that long.
He missed hitting the car in front by that much.
2 [usually in negatives] spoken as much as in the present situation or as much as has been stated:
I'm sorry, I hadn't realized the situation was that bad.
No one expected it to cost that much.
The advanced exam is more difficult, but not many students progress that far.
3

not (all) that long/many etc

spoken used to mean fairly short, only a few etc:
Will's not that tall, considering he's 16.
The film wasn't all that good.
4 British English spoken informal used to emphasize how big, bad, much etc something is:
I was that embarrassed I didn't know what to say.

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