Meaning of color up | Babel Free

Definitions

1. To blush (to go red).
2. 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.

Examples

“Alice had already begun to colour up and was beginning to speak⟳, when her Ladyship perceiving her displeasure, continued thus.”

CEFR level