The term 'TURN UP THE HEAT!' can be represented by three different crossword solutions: BRR (3 letters), BRRR (4 letters) and IMCOLD (6 letters). BRR is an onomatopoeia used to express a shiver or chill, while BRRR is an intensification of the same sound. IMCOLD is an expression of feeling cold. Together, these three solutions represent the idea of turning up the heat, as they all express a feeling of coldness that could be remedied by increasing the temperature.