What does fill up mean?
fill up
Definition
To put fuel into the tank of a vehicle.
Example sentences
I filled up on Friday and the tank's already half empty — something's not right.
I filled up on Friday and the tank's already half empty — something's not right.
Let's fill up before we hit the road; gas always costs more out on the highway.
Let's fill up before we hit the road; gas always costs more out on the highway.