kill time - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Pass time aimlessly. For example, There was nothing to do, so I sat around killing time until dinner was ready. This idiom was first recorded about 1768.