Dictionary.com
Thesaurus.com

pollice verso

American  
[pohl-li-ke wer-soh, pol-uh-see vur-soh] / ˈpoʊl lɪˌkɛ ˈwɛr soʊ, ˈpɒl ə si ˈvɜr soʊ /

adverb

Latin.

  1. with thumbs turned downward: the sign made by spectators calling for the death of a defeated gladiator in the ancient Roman circus.

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.