fill up

phrasal verb·1 sense·particle up

Meanings

1

Make completely full

Why “up”? Filling to the top. Reaching the upper limit means finishing.

Fill up the tank, please.
Please fill the tank to its maximum capacity.
She filled up the bottle at the tap.
She filled the bottle to its maximum capacity at the tap.

Don't confuse with

fill upfill out

Fill up means make completely full. Fill out means complete a form by writing in the required information.

Test yourself

Fill up the tank, please. What does it mean?

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