noun, masculine/ʃa.se.kʁwa.ze/plural: chassés-croisés
chassé-croisé (a figure between two partners, in which one chassés left then right, while the other chassés right then left); any movement of people; (specifically) a large number of simultaneous departures and arrivals in holiday seasons, often resulting in traffic congestion
“En ce premier grand week-end de chassé-croisé des vacances d'été, les marins-pompiers de Marseille appellent à la plus grande vigilance et rappellent les précautions essentielles en cette période.”