|Origin:||cohors 'enclosed place, people in an enclosure, unit of soldiers in the ancient Roman army'|
someone's cohorts are their friends who support them and stay loyal to them - used in order to show disapproval:
Mark and his cohorts eventually emerged from the studio.
a group of people of the same age, social class etc, especially when they are being studied:
a cohort of 386 patients aged 65 plus