There are 2 definitions of fill up in English:

fill up1

1Become completely full: the dining car filled up
1.1Fill the fuel tank of a car.
More example sentences
  • What happens if you drive the car out of state and fill up with high-sulfur fuel?
  • The AA advises customers to shop around for fuel and to avoid filling up at motorway service stations.
  • Just recently a relative of mine was relieved of her handbag while getting into her car after filling up at a local petrol station.
See parent entry: fill

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Word of the day iconoclasm
Pronunciation: īˈkänəˌklazəm
noun
attacking or rejecting cherished beliefs or established values...

There are 2 definitions of fill up in English:

fill-up2

Syllabification: fill-up

noun

An instance of making something completely full, especially the fuel tank of an automobile: free coffee with fill-up
More example sentences
  • They passed off Samantha like a baton, alternately sprinting through the relay of grocery shopping, dry cleaning drop-offs, and gas tank fill-ups.
  • Apart from the obvious financial benefits of running a diesel-powered car, plus the convenience of longer ranges between fuel fill-ups, there is the massive mid-range pulling power.
  • Noise levels are low at all times, and the car makes short work of long journeys, with the 80 litre fuel tank giving at least 600 miles between fill-ups.

Definition of fill up in: