Question 1

What does "gas up" mean?

Accepted Answer

To fill a vehicle's fuel tank with gasoline before driving.

Question 2

How do you use "gas up" in a sentence?

Accepted Answer

We need to gas up before we get on the motorway — the tank is almost empty.

Question 3

Is "gas up" formal or informal?

Accepted Answer

"gas up" is informal — used mainly in casual conversation. Primarily North American English. British speakers typically say 'fill up' or 'get petrol'. Used both transitively ('gas up the car') and intransitively ('we gassed up before the highway'). Common in everyday spoken American English.

gas up

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