The term 'cold reaction' can be broken down into four crossword solutions: BRR (3 letters), BRRR (4 letters), ICYSTARE (8 letters), and GOOSEBUMPS (10 letters). BRR is an onomatopoeic word used to express a shiver or chill, while BRRR is an extended version of the same sound. ICYSTARE is a combination of two words, 'ICY' and 'STARE', which together describe a cold, emotionless look. Finally, GOOSEBUMPS is a phrase used to describe the physical reaction of raised bumps on the skin due to a sudden chill. All of these terms are related to the concept of a cold reaction.