To arrive or occur in rapid succession; used to describe a continuous stream of people, things, or events appearing one after the other.

To arrive or occur in quick succession; used to describe people, events, or problems that happen one after the other continuously.

rubbing shoulders and following closely in each others' footsteps; describes a location that is crowded or packed with people

shoulder to shoulder and heel to heel; used to describe a place that is extremely crowded or packed with people