The phrase "free flu" refers to a situation where many people have the flu virus, making it easily spread from person to person without any barriers or restrictions. Full definition
Many corporations offer free flu shots on site or provide vouchers you can take to local pharmacies. (health.com)
Many employer - sponsored health care plans offer free flu shot coverage at clinics. (fortune.com)
You can also visit many walk - in clinics, even at places like your local grocery store, to get very low - cost or even free flu vaccines for the entire family. (verywellfamily.com)