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quis custodiet ipsos custodes?

American  
[kwis koo-stoh-dee-et ip-sohs koo-stoh-deys, kwis kuh-stoh-dee-it ip-sohs kuh-stoh-deez] / kwɪs kʊˈstoʊ diˌɛt ˈɪp soʊs kʊˈstoʊ deɪs, kwɪs kəˈstoʊ di ɪt ˈɪp soʊs kəˈstoʊ diz /
Latin.

  1. who shall keep watch over the guardians?

quis custodiet ipsos custodes? British  
/ kwɪs kʊsˈtəʊdɪˌɛt ˈɪpsɒs kʊsˈtəʊdiːz /

  1. who will guard the guards?

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.