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"fill in" vs "fill up"

Both 'fill up' and 'fill in' are correct phrases, but they are used in different contexts. 'Fill up' is used when talking about filling something to its full capacity, like a gas tank or a glass with water. 'Fill in' is used when completing a form, document, or providing information in a space. They are not interchangeable and have distinct meanings.

Last Updated: March 23, 2024

fill in

This phrase is correct and commonly used in English when referring to completing a form, document, or providing information in a space.

Use 'fill in' when you need to complete a form, document, or provide information in a designated space. It implies adding necessary details to something.

Examples:

  • Please fill in your name and address on the form.
  • I need to fill in the missing information on this report.
  • Could you fill in the blanks in this crossword puzzle?
  • She asked me to fill in for her at the meeting while she was away.
  • The teacher asked the students to fill in the answers on the test paper.

Alternatives:

  • complete
  • write in
  • enter
  • supply
  • add information to

fill up

This phrase is correct and commonly used in English when referring to filling something to its full capacity.

Use 'fill up' when you want to convey the idea of making something full or reaching its maximum capacity, like filling up a gas tank or a glass with water.

Examples:

  • Please fill up the gas tank before we leave.
  • The restaurant was full, so we couldn't fill up the table with more chairs.
  • I need to fill up my water bottle before going for a run.
  • The kids were thirsty, so they quickly filled up their cups with juice.
  • She decided to fill up the bathtub with warm water for a relaxing bath.

Alternatives:

  • top up
  • fill to the brim
  • fill to capacity
  • fill completely
  • fill to the top

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