Kill time ...

✔️Very common idiom used in casual speaking

✔️You can use “kill time” to say you’re going to spend time doing something while you’re waiting to do something else.

✔️Example Usage

Let’s pretend my mom can only give me a ride to the place where I’m going to interview at 2 pm, however, my interview doesn’t start until 4:00 pm. This means I have 2 hours to wait.

In this situation, I can say ...
•I’m going to kill time reading my book at the cafe across the street before my interview.

Another example:
•While waiting for the bus every morning, my brother kills time by playing video games on his phone.