kill (an amount of time)
To engage in an activity, usually an aimless or idle one, to occupy oneself, especially with the goal of making the amount of time seem to pass more quickly or less slowly. I'm going to walk down to the bookstore to kill a couple hours before my flight. Do you want anything? The game is great if you want to kill a few minutes here and there, but it gets pretty tiresome playing it for long stretches.
kill time
To engage in an activity, usually a rather aimless or idle one, with the goal of making time seem to pass more quickly or less slowly. I'm going to walk down to the bookstore to kill time before my flight. Do you want anything? It used to be that people killed time at the train station by talking to each other, but now everyone is nose-deep in their phone.
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