stay cool(redirected from stay her cool)
1. Literally, to maintain a cool physical temperature, especially to avoid overheating. This heat wave has been brutal, but we've been staying cool, thanks to the new air-conditioning unit in the office. The workers stayed cool in the shade during their lunch break.
2. To remain calm and composed; to not become angry or flustered. Your opponent is going to try to antagonize you during the debate, so just stay cool. I always try to stay cool when dealing with angry customers, even when they're being totally unreasonable.