And you can fill in a form because you're supplying missing information. Fill out is generally used when you tell someone to enter all the fields on a form of more than one field. Please fill out this Ò€¦

To my mind, documents aren't something you fill in - at most you Ò€¦ In your construction, the meaning of on is approximately using. That's to say, he filled up [his car fuel tank] on / using / with fuel. Same as if you're still hungry, fill up [your stomach] on / with bread. What is the difference between fulfill and fill? In the following example, do they have the same meaning? I'll fill the form tomorrow.

What is the difference between fulfill and fill? In the following example, do they have the same meaning? I'll fill the form tomorrow. I'll fulfill the form tomorrow.