flag up

British

verb

(tr; adverb) to bring (something) to someone's attention; point out

"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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The linesman has been told all season not to put their flag up, so their brain has been trained.

From BBC • Feb. 15, 2026

Teams can flag up to 30 plays for review per game through a league portal — including isolated calls or themes spanning multiple games.

From Los Angeles Times • Aug. 3, 2025

San Ciro's restaurant in Edinburgh have a Scotland flag up with the words 'Napoli.

From BBC • May 11, 2025

Casting doubt on Guardiola and Manchester City is a hazardous business given their unprecedented history of Premier League success, but there is no escaping that these losses, and the manner of them, flag up trouble.

From BBC • Nov. 9, 2024

I could see their silver flag up ahead, only one guard, who wasn’t even looking in my direction.

From "The Titan's Curse" by Rick Riordan

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