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Can I replace "fill out" with "fill up" without any change in the meaning in this context?
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User_gary

Can I replace "fill out" with "fill up" without any change in the meaning in this context?

No, but you can say fill in the form below. You can fill up a car with petrol/gas/gasoline/gasolene.
CB
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Aren't prepositions the worst?

Fill in the blanks.

Fill out or fill in the form.

I filled up the entire space allotted for "additional comments" and still didn't say everything I wanted to.

But don't fill up the form, don't fill out the blanks... it's very confusing!
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Comments  
Thank you.

In India we usually say, "fill up the blanks", we don't say "fill out the blanks" or "fill in the blanks". So I'm little confused.
 BarbaraPA's reply was promoted to an answer.
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