A gelatinous glue for glazing or sizing canvas, paper, plaster or wood; often made from animal skins.
"The artist prepared the wooden panel by applying a layer of traditional sizing made from crushed fish skins to seal its pores before painting."
In plain English: Sizing is figuring out how big something needs to be so it fits properly.
"The sizing helped keep my new shirt from shrinking after washing."
Usage: Sizing refers to the adhesive substance used to prepare surfaces like canvas and paper before applying paint or other materials. It is distinct from general adhesives because it specifically creates a barrier that prevents absorption of subsequent layers.
present participle of size
"The sizing machine carefully applies the starch to each shirt cuff before they are folded and packed."
In plain English: To size something means to measure it and figure out exactly how big it is.
"She spent too much time sizing up her neighbors before deciding to say hello."