mass in

British

verb

(adverb) to fill or block in (the areas of unified colour, shade, etc) in a painting or drawing

"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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mass in

Pope Leo extended an olive branch to them last October by celebrating mass in Latin at St. Peter's Basilica in Rome.

From Barron's ● Jul. 1, 2026

For Americans with sarcopenic obesity, which is characterized by extra weight and reduced muscle mass in people mostly older than 65, frailty is a major concern.

From MarketWatch ● Jun. 25, 2026

Ebola vaccines would not be used en mass in the same way as during the Covid pandemic.

From BBC ● May 22, 2026

The situation came to a critical mass in 2024 when Musk sued OpenAI for diverging from its nonprofit mission.

From Slate ● Apr. 30, 2026

They did, however, allow for several other fates, which depend on the amount of mass in the cosmos.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

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