Wiktionary
color up
alt. 1 To blush (to go red). 2 (context poker English) To exchange a high number of low-value chips (of one color) for a lower number of higher value (of a different color), but keeping the same overall value. vb. 1 To blush (to go red). 2 (context poker English) To exchange a high number of low-value chips (of one color) for a lower number of higher value (of a different color), but keeping the same overall value.
Usage examples of "color up".
Don't color up, and don't look as if you were going to quarrel with me!