Under the weather Definition 1 of 2Pro Tip 1/3Physical Health Implies minor illness, not severe or life-threatening conditions. Since catching a cold, I've been feeling under the weather. Pro Tip 2/3Not Contagious Use when your condition won't spread to others. I'm just under the weather, nothing contagious! Pro Tip 3/3Temporary State Suggests a brief period of feeling unwell. I'll join you for a run tomorrow if I'm not under the weather.