mass in

mass in

vb
(Art Terms) (adverb) to fill or block in (the areas of unified colour, shade, etc) in a painting or drawing
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
He added in a speech addressed to the mass in sit-in arena north of Ramadi: "There are some who considered as Anbar,s sons but described sit-ins of Anbar as sectarian stressing that those are dismissed by public in sit-ins arenas claiming rights and national unity and standing against any attempt to dismantling Iraq Alwani stressed that sit-ins squares are for honest and Iraqi free sons who will not allow anyone with agendas or political goals to distort their squares .
Their other option was to go to the English Mass in the next town over.
"The Mexicans used to mass in a soccer field near the Chula Vista station, just east of San Ysidro," he recalls.