In case of something Definition 1 of 4Pro Tip 1/2Emergency Preparedness Use 'in case of' to express measures for unplanned situations, emphasizing preparedness. Keep a flashlight in your car in case of a power outage. Pro Tip 2/2Not Imminent 'In case of' suggests the situation isn't expected soon but it’s wise to be ready. Save these phone numbers in case of emergencies.